fix(proxy): initialize image proxies after the proxy is set up

The ImageProxy for TMDB and TheTVDB were initialized before the proxy settings were set up, so they
were ignoring the proxy settings.

fix #1787

server/routes/imageproxy.ts

@@ -4,27 +4,40 @@ import { Router } from 'express';
 
 const router = Router();
 
-const tmdbImageProxy = new ImageProxy('tmdb', 'https://image.tmdb.org', {
-  rateLimitOptions: {
-    maxRequests: 20,
-    maxRPS: 50,
-  },
-});
-const tvdbImageProxy = new ImageProxy('tvdb', 'https://artworks.thetvdb.com', {
-  rateLimitOptions: {
-    maxRequests: 20,
-    maxRPS: 50,
-  },
-});
+// Delay the initialization of ImageProxy instances until the proxy (if any) is properly configured
+let _tmdbImageProxy: ImageProxy;
+function initTmdbImageProxy() {
+  if (!_tmdbImageProxy) {
+    _tmdbImageProxy = new ImageProxy('tmdb', 'https://image.tmdb.org', {
+      rateLimitOptions: {
+        maxRequests: 20,
+        maxRPS: 50,
+      },
+    });
+  }
+  return _tmdbImageProxy;
+}
+let _tvdbImageProxy: ImageProxy;
+function initTvdbImageProxy() {
+  if (!_tvdbImageProxy) {
+    _tvdbImageProxy = new ImageProxy('tvdb', 'https://artworks.thetvdb.com', {
+      rateLimitOptions: {
+        maxRequests: 20,
+        maxRPS: 50,
+      },
+    });
+  }
+  return _tvdbImageProxy;
+}
 
 router.get('/:type/*', async (req, res) => {
   const imagePath = req.path.replace(/^\/\w+/, '');
   try {
     let imageData;
     if (req.params.type === 'tmdb') {
-      imageData = await tmdbImageProxy.getImage(imagePath);
+      imageData = await initTmdbImageProxy().getImage(imagePath);
     } else if (req.params.type === 'tvdb') {
-      imageData = await tvdbImageProxy.getImage(imagePath);
+      imageData = await initTvdbImageProxy().getImage(imagePath);
     } else {
       logger.error('Unsupported image type', {
         imagePath,