freesailarr: no exponential notation in computed limits (3.0.2+up1.0.0)

The null-safe fallback helpers from #99 route values through fromYaml, which
parses every number as float64. Go's "%v" switches float64 to exponential
notation from about 1e6 upwards, so a bare byte count like 1048576 reached the
suffix check inside multiplyQuantity as "1.048576e+06" and the render aborted
with `unsupported resource quantity suffix "e+06"`.

Both printf "%v" sites in multiplyQuantity now go through a new formatNumber
helper that forces plain decimal notation and trims the padded zeros. The
second site is the quiet half of the bug: a fractional limitFactor together
with a bare number produced no error at all, just an invalid quantity such as
"1.4999985e+06" that only the API server rejects on apply. limitFactor is
typed "number" in this chart's values.schema.json, so a fractional factor is
an ordinary, schema-valid input.

All ten resource paths of the stack are affected and were verified one by one
(gluetun, qbittorrent and its configInit init container, prowlarr,
flaresolverr, radarr, recyclarr, sonarr, seerr, bazarr). The VPN, firewall and
container structure is untouched: rendering the chart with its default values
is byte-identical to main.

Teil von #157

freesailarr/templates/_helpers.tpl

@@ -67,7 +67,7 @@ Handles plain numbers ("2", "0.5", 1073741824), decimal ("1.5Gi"), binary
 results are printed without a decimal point.
 */}}
 {{- define "freesailarr.multiplyQuantity" -}}
-{{- $quantity := printf "%v" .quantity -}}
+{{- $quantity := include "freesailarr.formatNumber" .quantity -}}
 {{- $number := regexFind "^[0-9]+(\\.[0-9]+)?" $quantity -}}
 {{- if not $number -}}
 {{- fail (printf "cannot parse resource quantity %q" $quantity) -}}
@@ -80,7 +80,24 @@ results are printed without a decimal point.
 {{- if eq $product (floor $product) -}}
 {{- printf "%d%s" (int64 $product) $suffix -}}
 {{- else -}}
-{{- printf "%v%s" $product $suffix -}}
+{{- printf "%s%s" (include "freesailarr.formatNumber" $product) $suffix -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Render a number as a plain decimal string, never in exponential notation.
+
+Why this exists (issue #157): the null-safe fallback helpers pass values
+through fromYaml, which parses every number as float64. Go's "%v" switches
+float64 to exponential notation from about 1e6 upwards, so a bare byte count
+like 1048576 became "1.048576e+06" - not a valid Kubernetes quantity, and the
+render aborted. Strings ("512Mi") are passed through untouched.
+*/}}
+{{- define "freesailarr.formatNumber" -}}
+{{- if kindIs "float64" . -}}
+{{- regexReplaceAll "\\.?0+$" (printf "%.10f" .) "" -}}
+{{- else -}}
+{{- printf "%v" . -}}
 {{- end -}}
 {{- end -}}