feat: Gateway-API as an alternative to the Ingress in five annotation charts

Group 2 of the #114 sweep: the charts whose behaviour hangs off an nginx
annotation - calibre-web-automated, outline, paperless-ngx, zipline
(proxy-body-size) and freesailarr (rewrite-target).

Each gets the form the pilot (cyberchef, PR #115) fixed and group 1 (PR #116)
repeated: an httpRoute block off by default, a template rendering ONLY an
HTTPRoute with parentRefs - no Gateway, no gatewayClassName, no Certificate, no
implementation-specific policy object - render aborts on both modes at once
(naming both value paths), on an empty parentRefs and on a missing hostname,
empty hostnames meaning [ingress.domain], a schema entry closed against unknown
keys with an open parentRef definition, and a NOTES.txt that names the active
mode and what the mode costs.

Minor, additive, defaults unchanged: `helm template` with each chart's CI values
is byte-identical to origin/main for all five.

The upload limit is DOCUMENTED, not rebuilt (decision 2 of the issue). The
Gateway API knows no body size; a policy object would bind the chart to one
implementation. So the Gateway branch of NOTES.txt says, per chart and in the
chart's own terms, that the value is NOT ENFORCED and names where to set it: an
e-book library (calibre), an upload service (zipline), the web-UI half of the
document intake while the consume directory keeps no limit at all (paperless),
and the open #12 pair (outline).

Four findings that were not in the plan, each argued in the file it changes:

  freesailarr gated freesailarr.sharedIngressApps on ingress.enabled, and that
  list is read by the <APP>__SERVER__URLBASE variables as well as by the routing
  objects. In Gateway mode it would have come out EMPTY while the route served
  radarr, sonarr and prowlarr under their prefixes: UrlBase unset, assets and API
  calls linked at the host root, broken UI behind a Ready pod. The helper's two
  guards (seerr/mediathekarr only at "/", no duplicate paths) would have gone
  unenforced there too. Fixed with freesailarr.published (ingress.enabled OR
  httpRoute.enabled) - the same shape as sure.publishedOverTls in group 1, and
  identical to ingress.enabled while httpRoute.enabled is false. Measured: on
  origin/main with ingress.enabled: false the render emits ZERO URLBASE
  variables; with this change in Gateway mode it emits three.

  paperless-ngx was the last chart in the repository rendering its Ingress
  UNCONDITIONALLY. Without an ingress.enabled switch there is no second value
  path for the mutual-exclusion abort to name, and the Ingress plus its
  unconditional required() on clusterIssuer would have kept rendering in Gateway
  mode - a value demanded for nothing, which is issue #114's "Folge 1" and
  README guideline 12. The switch was added, defaulting to true, so the render is
  unchanged.

  paperless-ngx PAPERLESS_URL had no required() of its own: it relied on the
  Ingress template's, which stops firing the moment the Ingress is switchable.
  With httpRoute.hostnames set and ingress.domain empty it would have rendered
  "https://" and refused every login POST as a CSRF failure. It now carries its
  own required(), naming what the value is for.

  calibre-web-automated claimed, in values.yaml and in its schema, that
  ingress.domain is read nowhere but in the Ingress template. The HTTPRoute reads
  it, so the claim now holds only while both modes are off. Corrected rather than
  left standing - the same correction garage needed in group 1.

freesailarr is where the Gateway API is LESS machinery than what it replaces,
not a translation of it. rewrite-target applies per Ingress OBJECT, so
qBittorrent (no base path, prefix must be stripped) needed a second Ingress on
the shared host, which then had to repeat the first object's TLS secret name,
omit the cert-manager annotation conditionally so only one Certificate is
requested, and match an ImplementationSpecific regex path for the rewrite's
capture group. A URLRewrite filter applies per RULE: one route, one rule per
app, the filter on qBittorrent's rule, a plain PathPrefix. All four crutches
gone. It is also the only chart without httpRoute.hostnames - it has no
ingress.domain either, and a chart-global hostname list could not say which of
the ten apps it belonged to, so the hostnames stay in ingress.host and
<app>.ingress.host.

CI: one render overlay per chart under ci/httproute/, so the assertion is not
vacuum-green - ci/run-httproute-match-test.sh goes from 20 held assertions over
10 charts to 36 over 15. freesailarr's overlay moves bazarr onto a host of its
own, so the shared-host route AND the per-app route are both rendered; without
that the per-app branch would be exercised by nothing. The install-test fixtures
stay in Ingress mode: the install runs one configuration per chart, cyberchef
already pays that price against the real Gateway-API CRDs, and for paperless-ngx
that fixture is the only install of the valkey-subchart path anywhere.

README also carries a stale figure fixed here: the HTTPRoute test was still
documented at the pilot's 4 assertions over 2 charts, although group 1 had taken
it to 20 over 10.

Not proven, by construction: that traffic flows. No Gateway controller runs in
CI. Not run locally either: k3d, Docker, Trivy. The Gateway branch of NOTES.txt
is EXECUTED by the render test (a template error in it fails the job, verified)
but its text is printed by no pipeline stage - helm template does not emit
notes, and the install-test installs in Ingress mode.

Part of #114

ci/httproute/calibre-web-automated.yaml

@@ -0,0 +1,28 @@
+# Render-only overlay for ci/run-httproute-match-test.sh, applied LAST.
+#
+# Its one job is to put this chart into Gateway mode, because the convention
+# ships with httpRoute.enabled: false and the test would otherwise be green
+# over nothing. A chart that has an overlay here and still renders no
+# HTTPRoute FAILS the test - that is the whole point of the file existing.
+#
+# An overlay and not a change to ci/calibre-web-automated/test-values.yaml: the
+# install-test runs exactly ONE configuration per chart and the two modes are
+# mutually exclusive, so switching the fixture would drop this chart's Ingress
+# from the install for a CRD schema cyberchef's fixture already exercises
+# against the real Gateway-API CRDs. The install keeps the Ingress; the route is
+# held here, at render level, which is where its two silent failure modes live.
+#
+# ingress.enabled: false is not optional here - the chart aborts its own render
+# when both modes are true.
+#
+# ingress.domain comes from ci/calibre-web-automated/test-values.yaml;
+# httpRoute.hostnames is left empty on purpose, so the fallback to
+# ingress.domain is what the test exercises and the two cannot disagree here.
+ingress:
+  enabled: false
+httpRoute:
+  enabled: true
+  parentRefs:
+    - name: public
+      namespace: gateway
+      sectionName: https

ci/httproute/freesailarr.yaml

@@ -0,0 +1,55 @@
+# Render-only overlay for ci/run-httproute-match-test.sh, applied LAST.
+#
+# Its one job is to put this chart into Gateway mode, because the convention
+# ships with httpRoute.enabled: false and the test would otherwise be green
+# over nothing. A chart that has an overlay here and still renders no
+# HTTPRoute FAILS the test - that is the whole point of the file existing.
+#
+# An overlay and not a change to ci/freesailarr/test-values.yaml: the
+# install-test runs exactly ONE configuration per chart, and this chart's
+# fixture is the expensive one - it brings up a real Wireguard tunnel so that
+# ten containers can become Ready. Switching it into Gateway mode would trade
+# its Ingress objects for a CRD schema cyberchef's fixture already exercises
+# against the real Gateway-API CRDs. The install keeps the Ingresses; the
+# routes are held here, at render level, which is where their two silent
+# failure modes live.
+#
+# ingress.enabled: false is not optional here - ingress.enabled is this chart's
+# MASTER switch and defaults to true, so without this line the chart aborts its
+# own render with both modes on.
+#
+# WHAT THIS OVERLAY ACTUALLY COVERS, which is more than one route:
+#
+#   - ingress.host comes from the fixture (freesailarr.example.com), so the
+#     SHARED-domain shape is what renders: one HTTPRoute with one rule per app.
+#   - qbittorrent is enabled in the fixture, so its rule is in that route WITH
+#     the URLRewrite filter - the per-rule equivalent of the rewrite-target
+#     annotation, and the reason this chart needs no second routing object in
+#     this mode.
+#   - mediathekarr is enabled in the fixture with its ingress off, so the
+#     per-app selector is exercised in the negative direction too.
+#   - every rule's backendRef is checked against the per-app Services of the
+#     same render, which is where this chart differs from the rest of the
+#     sweep: it has one Service per app and the route carries the port NUMBER,
+#     not the name the Ingress uses.
+#
+# There is no httpRoute.hostnames key in this chart (see values.yaml): the
+# hostnames come from ingress.host and <app>.ingress.host, which the fixture
+# already sets.
+#
+# A SECOND APP IS GIVEN A HOST OF ITS OWN so the MIXED shape is covered as
+# well: bazarr then renders its own route (ci-freesailarr-bazarr-httproute)
+# while the rest stay on the shared host. Without it the per-app branch of the
+# template would never be entered by any test. Bazarr is the right one to move
+# because its sub-path mode needs a manual step inside the application anyway.
+ingress:
+  enabled: false
+httpRoute:
+  enabled: true
+  parentRefs:
+    - name: public
+      namespace: gateway
+      sectionName: https
+bazarr:
+  ingress:
+    host: bazarr.ci.local

ci/httproute/outline.yaml

@@ -0,0 +1,30 @@
+# Render-only overlay for ci/run-httproute-match-test.sh, applied LAST.
+#
+# Its one job is to put this chart into Gateway mode, because the convention
+# ships with httpRoute.enabled: false and the test would otherwise be green
+# over nothing. A chart that has an overlay here and still renders no
+# HTTPRoute FAILS the test - that is the whole point of the file existing.
+#
+# An overlay and not a change to ci/outline/test-values.yaml: the install-test
+# runs exactly ONE configuration per chart and the two modes are mutually
+# exclusive, so switching the fixture would drop this chart's Ingress from the
+# install for a CRD schema cyberchef's fixture already exercises against the
+# real Gateway-API CRDs. The install keeps the Ingress; the route is held here,
+# at render level, which is where its two silent failure modes live.
+#
+# ingress.enabled: false is not optional here - the chart aborts its own render
+# when both modes are true.
+#
+# ingress.domain comes from ci/outline/test-values.yaml and keeps feeding
+# Outline's URL variable in this mode too; httpRoute.hostnames is left empty on
+# purpose, so the fallback to ingress.domain is what the test exercises - and
+# the two therefore cannot disagree here, which is the state this chart needs
+# for its OIDC redirect URI to match.
+ingress:
+  enabled: false
+httpRoute:
+  enabled: true
+  parentRefs:
+    - name: public
+      namespace: gateway
+      sectionName: https

ci/httproute/paperless-ngx.yaml

@@ -0,0 +1,32 @@
+# Render-only overlay for ci/run-httproute-match-test.sh, applied LAST.
+#
+# Its one job is to put this chart into Gateway mode, because the convention
+# ships with httpRoute.enabled: false and the test would otherwise be green
+# over nothing. A chart that has an overlay here and still renders no
+# HTTPRoute FAILS the test - that is the whole point of the file existing.
+#
+# An overlay and not a change to ci/paperless-ngx/test-values.yaml: that
+# fixture is the ONLY install of the valkey-subchart path anywhere in this
+# repository (see its header), and the install-test runs exactly one
+# configuration per chart. Switching it into Gateway mode would trade that
+# coverage, plus this chart's Ingress, for a CRD schema cyberchef's fixture
+# already exercises against the real Gateway-API CRDs. The install keeps the
+# Ingress and the subchart; the route is held here, at render level, which is
+# where its two silent failure modes live.
+#
+# ingress.enabled: false is not optional here, and in THIS chart it is also
+# new: the switch was added with the Gateway mode (#114) and defaults to true,
+# so without this line the chart aborts its own render with both modes on.
+#
+# ingress.domain comes from ci/paperless-ngx/test-values.yaml and keeps feeding
+# PAPERLESS_URL in this mode too; httpRoute.hostnames is left empty on purpose,
+# so the fallback to ingress.domain is what the test exercises - and the two
+# therefore cannot disagree here, which is the state Django's CSRF check needs.
+ingress:
+  enabled: false
+httpRoute:
+  enabled: true
+  parentRefs:
+    - name: public
+      namespace: gateway
+      sectionName: https

ci/httproute/zipline.yaml

@@ -0,0 +1,29 @@
+# Render-only overlay for ci/run-httproute-match-test.sh, applied LAST.
+#
+# Its one job is to put this chart into Gateway mode, because the convention
+# ships with httpRoute.enabled: false and the test would otherwise be green
+# over nothing. A chart that has an overlay here and still renders no
+# HTTPRoute FAILS the test - that is the whole point of the file existing.
+#
+# An overlay and not a change to ci/zipline/test-values.yaml: the install-test
+# runs exactly ONE configuration per chart and the two modes are mutually
+# exclusive, so switching the fixture would drop this chart's Ingress from the
+# install for a CRD schema cyberchef's fixture already exercises against the
+# real Gateway-API CRDs. The install keeps the Ingress; the route is held here,
+# at render level, which is where its two silent failure modes live.
+#
+# ingress.enabled: false is not optional here - the chart aborts its own render
+# when both modes are true.
+#
+# ingress.domain comes from ci/zipline/test-values.yaml and keeps feeding
+# CORE_DEFAULT_DOMAIN in this mode too; httpRoute.hostnames is left empty on
+# purpose, so the fallback to ingress.domain is what the test exercises - and
+# the two therefore cannot disagree here.
+ingress:
+  enabled: false
+httpRoute:
+  enabled: true
+  parentRefs:
+    - name: public
+      namespace: gateway
+      sectionName: https