feat(ai-services): add Vietnamese NLP pipeline for property description analysis

Implement auto-tagging (amenities, location features, condition/legal),
content quality scoring with moderation integration, and FastAPI endpoints
for single and batch text analysis. Uses underthesea for Vietnamese
tokenization/POS when available, with regex fallback.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

libs/ai-services/app/main.py

@@ -6,7 +6,7 @@ from slowapi.util import get_remote_address
 
 from app.config import settings
 from app.middleware import verify_api_key
-from app.routers import avm, moderation
+from app.routers import avm, moderation, nlp
 
 limiter = Limiter(key_func=get_remote_address, default_limits=[settings.rate_limit])
 
@@ -33,6 +33,7 @@ app.add_middleware(
 
 app.include_router(avm.router)
 app.include_router(moderation.router)
+app.include_router(nlp.router)
 
 
 @app.get("/health")