refactor: improve PDF extraction, error handling, and proxy configuration

app/main.py

@@ -13,9 +13,7 @@ from app.config import settings
 from app.exceptions import (
     AppError,
     ConflictError,
-    ExternalAPIError,
     NotFoundError,
-    PdfProcessError,
     ValidationError,
 )
 from app.database import engine, init_db
@@ -87,14 +85,6 @@ def create_app() -> FastAPI:
     async def _validation_handler(request, exc):
         return JSONResponse(status_code=400, content={"error": exc.message})
 
-    @app.exception_handler(ExternalAPIError)
-    async def _external_api_handler(request, exc):
-        return JSONResponse(status_code=502, content={"error": exc.message})
-
-    @app.exception_handler(PdfProcessError)
-    async def _pdf_process_handler(request, exc):
-        return JSONResponse(status_code=500, content={"error": exc.message})
-
     @app.exception_handler(ConflictError)
     async def _conflict_handler(request, exc):
         return JSONResponse(status_code=409, content={"error": exc.message})