feat(v4.0): Library tabs + Sidebar OAuth badge + Sharing routes

app/routers/library.py: /api/library/recents|favorites|shared|published|private|workspace
app/routers/sharing.py: /api/pages/{id}/share|publish + page_shares
app/templates/base.html: OAuth badge 🦎/🐙, '→ Library' buttons
app/templates/library.html: page avec tabs + filtres source
app/routers/dashboard.py: auth_method + github_linked dans context
tests/test_app.py: tests library + sharing + recents

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, sharing
+from app.routers import dashboard, board, notes, api, auth, webhooks, collections, my_tasks, workspace, library, 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
@@ -66,6 +66,7 @@ app.include_router(library.router)
 app.include_router(admin.router)
 app.include_router(gitea_router)
 app.include_router(public_api.router)
+app.include_router(sharing.router)
 
 app.mount("/static", StaticFiles(directory="static"), name="static")