samba: NOTES.txt and the exponential-quantity fix (7.1.0+up4.23.10)

Teil von #157 und Teil von #43.

#157: multiplyQuantity turned its input into a string with printf "%v".
The null-safe fallback helpers from #99 route values through fromYaml, which
parses every number as float64, and Go switches float64 to exponential
notation from about 1e6 upwards. A request of 1048576 therefore reached the
suffix check as "1.048576e+06" and aborted the render. The second printf
"%v", the one that prints a non-integer product, never reaches that check at
all: with a fractional limitFactor it wrote an invalid quantity into the
manifest without a word. Both sites now go through the canonical
samba.formatNumber helper, identical to the other charts.

#43: adds templates/NOTES.txt. samba is a NodePort service, not a web app,
so the notes cover the SMB access path per client, the SMB3/encryption
requirements the chart pins in smb.conf, the users.conf field the 1Password
item must carry, that a restart drops every open SMB session, and that the
share PVCs are deleted by helm uninstall and re-created empty on a rename.

Minor bump: additive, appVersion unchanged.

samba/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 "samba.multiplyQuantity" -}}
-{{- $quantity := printf "%v" .quantity -}}
+{{- $quantity := include "samba.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 "samba.formatNumber" $product) $suffix -}}
+{{- end -}}
+{{- end -}}
+
+{{/*
+Render a number as a plain decimal string, never in exponential notation.
+
+Why this exists (issue #157): the null-safe fallback helpers pass values
+through fromYaml, which parses every number as float64. Go's "%v" switches
+float64 to exponential notation from about 1e6 upwards, so a bare byte count
+like 1048576 became "1.048576e+06" - not a valid Kubernetes quantity, and the
+render aborted. Strings ("512Mi") are passed through untouched.
+*/}}
+{{- define "samba.formatNumber" -}}
+{{- if kindIs "float64" . -}}
+{{- regexReplaceAll "\\.?0+$" (printf "%.10f" .) "" -}}
+{{- else -}}
+{{- printf "%v" . -}}
 {{- end -}}
 {{- end -}}