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/auth-mcs/package.json

@@ -0,0 +1,33 @@
+{
+  "name": "auth-microservice",
+  "version": "1.0.0",
+  "type": "module",
+  "description": "Standalone Identity Provider microservice with SSO, LDAP, and OIDC",
+  "license": "MIT",
+  "scripts": {
+    "dev": "next dev -p 3001",
+    "build": "next build",
+    "start": "next start -p 3001",
+    "lint": "next lint",
+    "db:generate": "npx @better-auth/cli generate",
+    "db:migrate": "npx @better-auth/cli migrate --yes"
+  },
+  "dependencies": {
+    "better-auth": "^1.4.0",
+    "@better-auth/sso": "^1.3.0",
+    "better-auth-credentials-plugin": "^0.4.0",
+    "ldap-authentication": "^3.3.6",
+    "better-sqlite3": "^11.9.1",
+    "next": "^15.0.0",
+    "react": "^18",
+    "react-dom": "^18",
+    "zod": "^3.23.0"
+  },
+  "devDependencies": {
+    "@types/better-sqlite3": "^7.6.12",
+    "@types/node": "^20",
+    "@types/react": "^18",
+    "@types/react-dom": "^18",
+    "typescript": "^5.0.0"
+  }
+}