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

.env.example

@@ -5,6 +5,10 @@ GITEA_OAUTH_CLIENT_ID=
 GITEA_OAUTH_CLIENT_SECRET=
 GITEA_WEBHOOK_SECRET=
 
+# ── GitHub ──
+GITHUB_OAUTH_CLIENT_ID=
+GITHUB_OAUTH_CLIENT_SECRET=
+
 # ── App ──
 APP_SECRET_KEY=change-me-to-random
 APP_HOST=0.0.0.0