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/radarr.js

@@ -15,6 +15,30 @@ function getFirstRadarrInstance() {
   return instances[0];
 }
 
+/**
+ * @openapi
+ * /api/radarr/queue:
+ *   get:
+ *     tags: [Radarr]
+ *     summary: Get Radarr queue
+ *     description: Proxy to Radarr's queue endpoint. Requires authentication and CSRF token.
+ *     security:
+ *       - CookieAuth: []
+ *       - CsrfToken: []
+ *     responses:
+ *       '200':
+ *         description: Queue data from Radarr
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *       '500':
+ *         description: Proxy error
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
 router.use(requireAuth);
 
 // Get queue
@@ -29,6 +53,30 @@ router.get('/queue', async (req, res) => {
   }
 });
 
+/**
+ * @openapi
+ * /api/radarr/history:
+ *   get:
+ *     tags: [Radarr]
+ *     summary: Get Radarr history
+ *     description: Proxy to Radarr's history endpoint. Requires authentication.
+ *     security:
+ *       - CookieAuth: []
+ *     parameters:
+ *       - name: pageSize
+ *         in: query
+ *         schema:
+ *           type: integer
+ *           default: 50
+ *         description: Number of records per page
+ *     responses:
+ *       '200':
+ *         description: History data from Radarr
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ */
 // Get history
 router.get('/history', async (req, res) => {
   try {
@@ -66,6 +114,36 @@ router.get('/movies', async (req, res) => {
   }
 });
 
+/**
+ * @openapi
+ * /api/radarr/notifications/sofarr-webhook:
+ *   post:
+ *     tags: [Radarr]
+ *     summary: Configure Sofarr webhook
+ *     description: One-click setup for Sofarr webhook notification in Radarr. Requires authentication and CSRF token.
+ *     security:
+ *       - CookieAuth: []
+ *       - CsrfToken: []
+ *     responses:
+ *       '200':
+ *         description: Configured notification
+ *         content:
+ *           application/json:
+ *             schema:
+ *               type: object
+ *       '400':
+ *         description: Missing configuration
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ *       '503':
+ *         description: Radarr not configured
+ *         content:
+ *           application/json:
+ *             schema:
+ *               $ref: '#/components/schemas/ErrorResponse'
+ */
 // Notification proxy routes (Phase 3)
 // GET /api/radarr/notifications - list all notifications
 router.get('/notifications', async (req, res) => {