security: fix issues #1-4 from security audit

#1 Session cookie: add secure (production-only) and sameSite=strict
    to prevent transmission over HTTP and cross-site request abuse.
#2 Remove Emby AccessToken from cookie payload — it was stored in
    the browser cookie but is never needed client-side; reduces blast
    radius if cookie is ever exposed.
#3 Add requireAuth middleware to all proxy routes (/api/emby,
    /api/sabnzbd, /api/sonarr, /api/radarr) — previously unauthenticated,
    now require a valid emby_user session cookie.
#4 Remove open CORS wildcard (cors() with no options). The frontend
    is served from the same origin so no CORS headers are required.
    Also update clearCookie() to include matching cookie options.

server/routes/auth.js

@@ -37,14 +37,16 @@ router.post('/login', async (req, res) => {
     console.log(`[Auth] Login successful for user: ${user.Name}`);
     
     // Set authentication cookie
+    // Note: token is intentionally excluded from the cookie — it is not needed client-side
     const isAdmin = !!(user.Policy && user.Policy.IsAdministrator);
     res.cookie('emby_user', JSON.stringify({
       id: user.Id,
       name: user.Name,
-      isAdmin: isAdmin,
-      token: authData.AccessToken
+      isAdmin: isAdmin
     }), {
       httpOnly: true,
+      secure: process.env.NODE_ENV === 'production',
+      sameSite: 'strict',
       maxAge: 24 * 60 * 60 * 1000 // 24 hours
     });
     
@@ -91,7 +93,11 @@ router.get('/me', (req, res) => {
 
 // Logout
 router.post('/logout', (req, res) => {
-  res.clearCookie('emby_user');
+  res.clearCookie('emby_user', {
+    httpOnly: true,
+    secure: process.env.NODE_ENV === 'production',
+    sameSite: 'strict'
+  });
   res.json({ success: true });
 });
 

server/routes/emby.js

@@ -1,10 +1,13 @@
 const express = require('express');
 const axios = require('axios');
 const router = express.Router();
+const requireAuth = require('../middleware/requireAuth');
 
 const EMBY_URL = process.env.EMBY_URL;
 const EMBY_API_KEY = process.env.EMBY_API_KEY;
 
+router.use(requireAuth);
+
 // Get active sessions
 router.get('/sessions', async (req, res) => {
   try {

server/routes/radarr.js

@@ -1,10 +1,13 @@
 const express = require('express');
 const axios = require('axios');
 const router = express.Router();
+const requireAuth = require('../middleware/requireAuth');
 
 const RADARR_URL = process.env.RADARR_URL;
 const RADARR_API_KEY = process.env.RADARR_API_KEY;
 
+router.use(requireAuth);
+
 // Get queue
 router.get('/queue', async (req, res) => {
   try {

server/routes/sabnzbd.js

@@ -1,10 +1,13 @@
 const express = require('express');
 const axios = require('axios');
 const router = express.Router();
+const requireAuth = require('../middleware/requireAuth');
 
 const SABNZBD_URL = process.env.SABNZBD_URL;
 const SABNZBD_API_KEY = process.env.SABNZBD_API_KEY;
 
+router.use(requireAuth);
+
 // Get current queue
 router.get('/queue', async (req, res) => {
   try {

server/routes/sonarr.js

@@ -1,10 +1,13 @@
 const express = require('express');
 const axios = require('axios');
 const router = express.Router();
+const requireAuth = require('../middleware/requireAuth');
 
 const SONARR_URL = process.env.SONARR_URL;
 const SONARR_API_KEY = process.env.SONARR_API_KEY;
 
+router.use(requireAuth);
+
 // Get queue
 router.get('/queue', async (req, res) => {
   try {