feat: v6.0.0 PWA offline support

- manifest + icones, service worker (precache, network-first, Background Sync)

- module client FlowOffline (IndexedDB, queue, delta, flush) + hook editeur

- endpoints /api/v2/sync/{delta,batch,status} + moteur de sync (conflits LWW/orpheline/copie offline)

- migrations offline_sync_queue + sync_version (triggers)

- UI offline (banner, badge sync, toasts, icone dirty) + doc /help

- tests pytest (sync, migrations, SW, offline) + E2E Playwright; bump 6.0.0

app/main.py

@@ -33,6 +33,7 @@ from app.routers import (
     security,
     sharing,
     sidebar_config,
+    sync,
     webhooks,
     workspace,
 )
@@ -107,7 +108,7 @@ async def lifespan(_app: FastAPI):
 
 app = FastAPI(
     title="FlowDeck",
-    version="5.14.0",
+    version="6.0.0",
     docs_url="/docs" if settings.log_level == "DEBUG" else None,
     redoc_url=None,
     lifespan=lifespan,
@@ -147,6 +148,7 @@ app.include_router(agent.router)
 app.include_router(search.router)
 app.include_router(security.router)
 app.include_router(onboarding.router)
+app.include_router(sync.router)
 app.include_router(imports_router)
 app.include_router(import_page_router)
 
@@ -155,15 +157,16 @@ app.mount("/static", StaticFiles(directory="static"), name="static")
 
 @app.get("/manifest.json")
 async def pwa_manifest():
-    return {
-        "name": "FlowDeck",
-        "short_name": "FlowDeck",
-        "start_url": "/",
-        "display": "standalone",
-        "background_color": "#191919",
-        "theme_color": "#191919",
-        "icons": [{"src": "/static/icon-192.png", "sizes": "192x192", "type": "image/png"}],
-    }
+    """Serve the static web manifest from disk (same URL as before v6.0.0)."""
+    from fastapi.responses import FileResponse
+    return FileResponse("static/manifest.json", media_type="application/manifest+json")
+
+
+@app.get("/sw.js")
+async def service_worker():
+    """Serve the PWA service worker at top-level scope (/)."""
+    from fastapi.responses import FileResponse
+    return FileResponse("static/sw.js", media_type="application/javascript")
 
 
 # ═══════════ API aliases (v4.0.1) ═══════════