fix: Resolve UnboundLocalError for is_validator_count_question

- Renamed local variable from is_validator_count_question to is_validator_count_query
- This fixes the conflict where the imported function and local variable had the same name
- Python was treating it as a local variable before assignment, causing UnboundLocalError

Fixes: cannot access local variable 'is_validator_count_question' where it is not associated with a value

Author: anhmtk

backend/api/routers/chat_router.py

@@ -464,7 +464,7 @@ async def chat_with_rag(request: Request, chat_request: ChatRequest):
 
         # CRITICAL: Detect validator count questions for special handling
         # We will force-inject manifest and use lower similarity threshold, NOT hardcode
-        is_validator_count_question = is_validator_count_question(chat_request.message)
+        is_validator_count_query = is_validator_count_question(chat_request.message)
 
         # EXTERNAL DATA LAYER: Check for external data queries (weather, news, etc.)
         # This bypasses RAG and fetches real-time data from external APIs
@@ -985,7 +985,7 @@ def get_language_name(lang_code: str) -> str:
             chat_request=chat_request,
             rag_retrieval=rag_retrieval,
             is_origin_query=is_origin_query,
-            is_validator_count_question=is_validator_count_question,
+            is_validator_count_question=is_validator_count_query,
             is_stillme_query=is_stillme_query,
             is_news_article_query=is_news_article_query,
             is_philosophical=is_philosophical,
@@ -3021,7 +3021,7 @@ def estimate_tokens(text: str) -> int:
                 chat_request=chat_request,
                 context=context,
                 is_philosophical=is_philosophical,
-                is_validator_count_question=is_validator_count_question,
+                is_validator_count_question=is_validator_count_query,
                 is_origin_query=is_origin_query,
                 is_stillme_query=is_stillme_query,
                 detected_lang_name=detected_lang_name,