feat: монорепо миграция, Discover/SearxNG улучшения

- Миграция на монорепозиторий (apps/frontend, apps/chat-service, etc.)
- Discover: проверка SearxNG, понятное empty state при ненастроенном поиске
- searxng.ts: валидация URL, проверка JSON-ответа, авто-добавление http://
- docker/searxng-config: настройки для JSON API SearxNG

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/frontend/src/app/api/images/route.ts

@@ -0,0 +1,41 @@
+import searchImages from '@/lib/agents/media/image';
+import ModelRegistry from '@/lib/models/registry';
+import { ModelWithProvider } from '@/lib/models/types';
+
+interface ImageSearchBody {
+  query: string;
+  chatHistory: any[];
+  chatModel: ModelWithProvider;
+}
+
+export const POST = async (req: Request) => {
+  try {
+    const body: ImageSearchBody = await req.json();
+
+    const registry = new ModelRegistry();
+
+    const llm = await registry.loadChatModel(
+      body.chatModel.providerId,
+      body.chatModel.key,
+    );
+
+    const images = await searchImages(
+      {
+        chatHistory: body.chatHistory.map(([role, content]) => ({
+          role: role === 'human' ? 'user' : 'assistant',
+          content,
+        })),
+        query: body.query,
+      },
+      llm,
+    );
+
+    return Response.json({ images }, { status: 200 });
+  } catch (err) {
+    console.error(`An error occurred while searching images: ${err}`);
+    return Response.json(
+      { message: 'An error occurred while searching images' },
+      { status: 500 },
+    );
+  }
+};