v2.8.0 WIP: create/upload files + commit history + labels sync

- POST /api/gitea/projects/{owner}/{repo}/upload (binary upload)
- get_file_commits() in GiteaClient
- GET /api/gitea/projects/{owner}/{repo}/commits (per-file history)
- POST .../sync-labels (Gitea labels → FlowDeck tags)
- New file form + upload button in gitea_workspace.html topbar

app/auth/providers.py

@@ -244,8 +244,8 @@ def get_providers() -> list[OAuthProvider]:
         providers.append(gitea)
 
     github = GitHubProvider(
-        client_id=settings.github_client_id or "",
-        client_secret=settings.github_client_secret or "",
+        client_id=settings.github_oauth_client_id or "",
+        client_secret=settings.github_oauth_client_secret or "",
         redirect_uri=settings.oauth_redirect_uri or "",
     )
     if github.is_enabled():