feat: add http, snmp, docker plugins; new widgets and routes for traefik/unifi/ups

- Add HTTP monitor plugin: endpoint checking with status history, latency tracking, time-range views
- Add SNMP plugin: OID polling, device management, metric recording
- Add Docker plugin: container status, resource usage, widget
- Traefik: access log widget, request chart widget, expanded routes
- UniFi: clients widget, devices widget, expanded poll routes
- UPS: history widget, additional routes
- Update plugin index with new entries

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

unifi/routes.py

@@ -301,3 +301,57 @@ async def widget():
         active_alarms=active_alarms,
         top_clients=top_clients,
     )
+
+
+@unifi_bp.get("/widget/clients")
+@require_role(UserRole.viewer)
+async def widget_clients():
+    """HTMX dashboard widget: top active clients."""
+    limit = max(1, min(20, int(request.args.get("limit", 5) or 5)))
+    widget_id = request.args.get("wid", "0")
+
+    async with current_app.db_sessionmaker() as db:
+        result = await db.execute(
+            select(UnifiClientSnapshot)
+            .order_by(UnifiClientSnapshot.scraped_at.desc())
+            .limit(1)
+        )
+        snapshot = result.scalar_one_or_none()
+
+    clients = json.loads(snapshot.top_clients_json)[:limit] if snapshot else []
+    return await render_template(
+        "unifi/widget_clients.html",
+        clients=clients,
+        snapshot=snapshot,
+        widget_id=widget_id,
+    )
+
+
+@unifi_bp.get("/widget/devices")
+@require_role(UserRole.viewer)
+async def widget_devices():
+    """HTMX dashboard widget: infrastructure devices with optional type filter."""
+    type_filter = request.args.get("type_filter", "all")
+    widget_id = request.args.get("wid", "0")
+
+    async with current_app.db_sessionmaker() as db:
+        result = await db.execute(
+            select(UnifiDevice).order_by(UnifiDevice.state.desc(), UnifiDevice.name)
+        )
+        all_devices = result.scalars().all()
+
+    if type_filter == "wireless":
+        devices = [d for d in all_devices if d.device_type == "uap"]
+    elif type_filter == "wired":
+        devices = [d for d in all_devices if d.device_type != "uap"]
+    elif type_filter == "offline":
+        devices = [d for d in all_devices if d.state != 1]
+    else:
+        devices = list(all_devices)
+
+    return await render_template(
+        "unifi/widget_devices.html",
+        devices=devices,
+        type_filter=type_filter,
+        widget_id=widget_id,
+    )