feat: wire WebSocket router and add background refresh loop

Register ws router in main.py and add periodic ping/odoo refresh
that broadcasts updates to connected WebSocket clients.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/main.py

@@ -1,3 +1,4 @@
+import asyncio
 from contextlib import asynccontextmanager
 from pathlib import Path
 
@@ -25,13 +26,53 @@ odoo_client = OdooClient(
 )
 
 
+async def refresh_loop():
+    from routers.ws import broadcast
+    from modules.network_scanner import NetworkScanner
+
+    refresh = app_config.get_settings().get("refresh", {})
+    odoo_interval = refresh.get("odoo_minutes", 5) * 60
+    network_interval = refresh.get("network_minutes", 10) * 60
+    ping_interval = refresh.get("ping_seconds", 60)
+
+    last_odoo = 0
+    last_network = 0
+    last_ping = 0
+
+    while True:
+        now = asyncio.get_event_loop().time()
+
+        if now - last_ping >= ping_interval:
+            try:
+                scan_config = app_config.get_network_scan_config()
+                scanner = NetworkScanner(scan_config.get("subnet", "192.168.1.0/24"))
+                nodes = app_config.get_nodes()
+                ips = [n["ip"] for n in nodes]
+                statuses = await scanner.ping_all(ips)
+                await broadcast("ping_update", statuses)
+            except Exception:
+                pass
+            last_ping = now
+
+        if now - last_odoo >= odoo_interval:
+            try:
+                await broadcast("odoo_refresh", {"trigger": "scheduled"})
+            except Exception:
+                pass
+            last_odoo = now
+
+        await asyncio.sleep(10)
+
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     try:
         await odoo_client.authenticate()
     except Exception as e:
         print(f"Warning: Could not connect to Odoo: {e}")
+    task = asyncio.create_task(refresh_loop())
     yield
+    task.cancel()
 
 
 app = FastAPI(title="TV Dashboard API", lifespan=lifespan)
@@ -43,12 +84,13 @@ app.add_middleware(
     allow_headers=["*"],
 )
 
-from routers import network, tasks, calendar, services
+from routers import network, tasks, calendar, services, ws
 
 app.include_router(network.router)
 app.include_router(tasks.router)
 app.include_router(calendar.router)
 app.include_router(services.router)
+app.include_router(ws.router)
 
 
 @app.get("/api/health")