docs(swagger): add JSDoc @openapi for proxy routes

- Sonarr: queue, history, series, notifications CRUD, webhook setup
- Radarr: queue, history, movies, notifications CRUD, webhook setup
- SABnzbd: queue, history
- Emby: sessions, users
- Document that these are authenticated proxies to upstream services
- Include notification proxy endpoints for webhook configuration

server/routes/sabnzbd.js

@@ -5,9 +5,32 @@ const router = express.Router();
 const requireAuth = require('../middleware/requireAuth');
 const sanitizeError = require('../utils/sanitizeError');
 
+/**
+ * @openapi
+ * /api/sabnzbd/queue:
+ *   get:
+ *     tags: [SABnzbd]
+ *     summary: Get SABnzbd queue
+ *     description: Proxy to SABnzbd's queue endpoint. Requires authentication.
+ *     security:
+ *       - CookieAuth: []
+ *     responses:
+ *       '200':
+ *         description: Queue data from SABnzbd
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *       '500':
+ *         description: Proxy error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
 router.use(requireAuth);
 
-// Get current queue
+// GET /api/sabnzbd/queue
 router.get('/queue', async (req, res) => {
   try {
     const response = await axios.get(`${process.env.SABNZBD_URL}/api`, {
@@ -23,7 +46,31 @@ router.get('/queue', async (req, res) => {
   }
 });
 
-// Get history
+/**
+ * @openapi
+ * /api/sabnzbd/history:
+ *   get:
+ *     tags: [SABnzbd]
+ *     summary: Get SABnzbd history
+ *     description: Proxy to SABnzbd's history endpoint. Requires authentication.
+ *     security:
+ *       - CookieAuth: []
+ *     parameters:
+ *       - name: limit
+ *         in: query
+ *         schema:
+ *           type: integer
+ *           default: 50
+ *         description: Number of history records to return
+ *     responses:
+ *       '200':
+ *         description: History data from SABnzbd
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ */
+// GET /api/sabnzbd/history
 router.get('/history', async (req, res) => {
   try {
     const response = await axios.get(`${process.env.SABNZBD_URL}/api`, {