rename: homelab-gateway → telegram-gateway

Aligns the project name with the public URL (tg.arcodange.fr) and the
Arcodange organization conventions. The 'homelab-gateway' name was too
generic.

Touches: chart name + helpers, image registry path, Go module path,
secret/configmap names, deployment mountPath, all docs.

chart/templates/ingress.yaml

@@ -2,10 +2,10 @@
 apiVersion: networking.k8s.io/v1
 kind: Ingress
 metadata:
-  name: {{ include "homelab-gateway.fullname" . }}
+  name: {{ include "telegram-gateway.fullname" . }}
   namespace: {{ .Release.Namespace }}
   labels:
-    {{- include "homelab-gateway.labels" . | nindent 4 }}
+    {{- include "telegram-gateway.labels" . | nindent 4 }}
   {{- with .Values.ingress.annotations }}
   annotations:
     {{- toYaml . | nindent 4 }}
@@ -28,7 +28,7 @@ spec:
             pathType: {{ .pathType }}
             backend:
               service:
-                name: {{ include "homelab-gateway.fullname" $ }}
+                name: {{ include "telegram-gateway.fullname" $ }}
                 port:
                   number: {{ $.Values.service.port }}
           {{- end }}