admin: dedupe backend endpoints — stale git.nech.pl pair made Sveltia refuse the config

public/admin/config.yml

@@ -5,10 +5,6 @@ site_url: https://me.nech.pl
 backend:
   name: gitlab
   repo: pln/www
-  # Self-hosted GitLab — both base_url and api_root must point at git.nech.pl
-  # (Sveltia does not infer them from the repo URL).
-  base_url: https://git.nech.pl
-  api_root: https://git.nech.pl/api/v4
   # Auth: gate (api.nech.pl/gate/v1) is the auth service — magic email-code
   # login, then a postMessage handshake hands Sveltia the pln-cms token.
   # Rationale: Sveltia hardcodes Bearer (gitlab backend authScheme) and this
@@ -16,14 +12,12 @@ backend:
   # git.nech.pl directly — gate's /gitlab/ proxy translates, and gate's
   # authorize page implements the Sveltia handshake natively (source-verified
   # against sveltia-cms shared/auth.js + sveltia-cms-auth outputHTML).
-  # app_id kept only as history: direct GitLab OAuth (pkce) is unreachable on
-  # this GitLab version.
   base_url: https://api.nech.pl
   auth_endpoint: gate/v1/oauth/authorize
   api_root: https://api.nech.pl/gate/v1/gitlab
-  # Paste the OAuth application ID from git.nech.pl (Admin area -> Applications;
-  # redirect URI https://me.nech.pl/admin/, "Confidential" unchecked, api scope).
-  app_id: d8696dc65c5f2308ce16f3a0ddbcfb913915562917ad4647cfaa3ea843dee287
+  # app_id (d8696dc6…) from the git.nech.pl OAuth app is kept only as history:
+  # direct GitLab OAuth (pkce) is unreachable on this GitLab version.
+  # app_id: d8696dc65c5f2308ce16f3a0ddbcfb913915562917ad4647cfaa3ea843dee287
 
 media_folder: public/images/blog
 public_folder: /images/blog