refactor(ai): update AI module and dependencies

- Upgraded @ai-sdk/openai from version 1.3.23 to 2.0.23 and ai from 4.3.17 to 5.0.28 in package.json and pnpm-lock.yaml for enhanced functionality.
- Removed the AIAgentController, AiDeepReadingController, and their associated services and DTOs to streamline the AI module.
- Simplified the AiModule by retaining only essential services and controllers.
- Updated the default AI model in configs.default.ts from 'gpt-4o-mini' to 'gpt-5o-mini' for improved performance.
- Adjusted related dependencies and configurations to reflect these changes.

Signed-off-by: Innei <tukon479@gmail.com>

Author: Innei

apps/core/package.json

@@ -48,7 +48,7 @@
     "changelog": true
   },
   "dependencies": {
-    "@ai-sdk/openai": "1.3.23",
+    "@ai-sdk/openai": "2.0.23",
     "@algolia/client-search": "^4.22.1",
     "@babel/core": "7.28.3",
     "@babel/plugin-transform-modules-commonjs": "7.27.1",
@@ -77,7 +77,7 @@
     "@typegoose/auto-increment": "4.13.0",
     "@typegoose/typegoose": "12.17.0",
     "@types/jsonwebtoken": "9.0.10",
-    "ai": "4.3.17",
+    "ai": "5.0.28",
     "algoliasearch": "4.24.0",
     "axios": "^1.10.0",
     "axios-retry": "4.5.0",
@@ -164,4 +164,4 @@
     "vite-tsconfig-paths": "5.1.4",
     "vitest": "1.5.2"
   }
-}
+}