zipline: NOTES.txt and the exponential-quantity fix (7.1.0+up4.7.0)

Part of #43 — templates/NOTES.txt.

The rule from the approved plan was that a NOTES.txt repeating the values is
worthless, so this one prints what an operator would otherwise look up in the
templates: the rendered URL (or the port-forward command when the Ingress is
off, plus the reason ingress.domain stays required — it is
CORE_DEFAULT_DOMAIN), the two op:// refs together with the exact field names
the 1Password items must carry ("connection-url" and "server-secret", because
the operator names the Secret keys after the item's fields), and the traps of
this chart: the setup page hands the super administrator to whoever reaches
the URL first, migrations run inside the startup probe's window (computed
from the effective probe values), a database outage leaves the pod running
and NotReady because liveness deliberately uses "/", the upload ceiling that
actually bites is the Ingress annotation and not the app's fixed 500mb, /tmp
is an emptyDir counted against the ephemeral-storage limit (computed) so an
oversized upload evicts the pod, and the uploads PVC is an ordinary release
resource that "helm uninstall" deletes. Conditional sections cover scaleDown
/ replicas: 0, more than one replica against the single ReadWriteOnce claim,
and a set zipline.env. No domain is baked into the chart; every host is
rendered from the values, examples use example.com.

Part of #157 — multiplyQuantity.

The null-safe fallbacks pass values through fromYaml, which parses every
number as float64, and Go's "%v" switches float64 to exponential notation
from about 1e6 upwards: a bare "1048576" arrived as "1.048576e+06" and the
render aborted on the suffix check. This is the canonical correction agreed
for all charts, taken over verbatim with this chart's prefix — the input and
the non-integer product now go through a formatNumber helper, and the
toYaml/fromYaml round trip is not touched, since it is not the cause.

Measured against ci/zipline/test-values.yaml on the chart's only resources
path, zipline.resources: before, both requests.memory=1048576 and
requests.ephemeralStorage=1048576 aborted with
  unsupported resource quantity suffix "e+06" in "1.048576e+06"
after, they render with the limits "3145728", while the 65536 fallback probe
still yields 196608 unchanged. Rendered manifests are byte-identical to the
previous version for the default values.

zipline/Chart.yaml

@@ -16,7 +16,7 @@ type: application
 # This is the chart version. This version number should be incremented each time you make changes
 # to the chart and its templates, including the app version.
 # Versions are expected to follow Semantic Versioning (https://semver.org/)
-version: 7.0.0+up4.7.0
+version: 7.1.0+up4.7.0
 
 # This is the version number of the application being deployed. This version number should be
 # incremented each time you make changes to the application. Versions are not expected to