feat(v4.0): Settings/Integrations — Gitea + GitHub connect/disconnect matrix

- GitHub integration row ajoutée (🦎 Gitea + 🐙 GitHub)
- Badge 'Primary' sur le provider principal (auth_method)
- Disconnect masqué pour le provider principal
- authMethod, githubLinked, giteaLinked dans Alpine data
- loadGithubStatus() + disconnectGithub() methods
- Matrice respectée: local→déco OK, gitea→déco github OK, github→déco gitea OK

app/main.py

@@ -13,7 +13,7 @@ from app.config import settings
 from app.db import init_db
 from app.middleware.csrf import CSRFMiddleware
 from app.middleware.security import ContentSecurityPolicyMiddleware, RateLimitMiddleware
-from app.routers import dashboard, board, notes, api, auth, webhooks, collections, my_tasks, workspace, public_api, admin
+from app.routers import dashboard, board, notes, api, auth, webhooks, collections, my_tasks, workspace, public_api, admin, sharing
 from app.routers.gitea import router as gitea_router
 from app.services.gitea_client import gitea
 from app.services.webhook_outbound import init_webhook_tables
@@ -62,6 +62,7 @@ app.include_router(webhooks.router)
 app.include_router(collections.router)
 app.include_router(my_tasks.router)
 app.include_router(workspace.router)
+app.include_router(library.router)
 app.include_router(admin.router)
 app.include_router(gitea_router)
 app.include_router(public_api.router)