FIX(gitea): gitea password policy to prevent force

Set passwordMode to initialOnlyDoNotUpdate to prevent Gitea from forcing
password changes on every pod restart. This resolves the issue where users
were continuously prompted to update their password, causing ArgoCD
authentication failures.

gitea/helm-values/gitea.yaml

@@ -18,6 +18,8 @@ gitea:
   admin:
     # Admin credentials managed via environment variables
     existingSecret: gitea-admin-secret
+    # Do not update password on every restart
+    passwordMode: initialOnlyNoReset
 
   config:
     server: