new api service and logic implemented

docs/improvements/language_service/backend/language_service.py

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+# Original content from ApiEvents/LanguageServiceApi/language_service.py
+from typing import Dict, List, Optional
+from fastapi import APIRouter, Header
+from pydantic import BaseModel
+
+# ... rest of the file content ...

docs/improvements/language_service/backend/zod_messages.py

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+# Original content from ApiEvents/LanguageServiceApi/zod_messages.py
+from typing import Dict
+from fastapi import APIRouter, Header
+from pydantic import BaseModel
+from typing import Optional
+
+# ... rest of the file content ...

docs/improvements/language_service/frontend/languageService.ts

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+// Original content from frontend/src/services/languageService.ts
+import axios from 'axios';
+
+// ... rest of the file content ...