Fix: Improve origin query detection and fix post-processing errors

- Add detection for 'công ty', 'team', 'nhóm' (company, team, group) in origin queries
- Add pattern matching for 'công ty nào', 'team nào', 'nhóm nào' + 'đã tạo ra bạn'
- Add English pattern: 'which/what organization/company/team/group created you'
- Fix ValueError: too many values to unpack in should_rewrite() call (line 5943)
- Fix format string error in epistemic state logging (line 6265)
- All origin query patterns now properly trigger SYSTEM_ORIGIN_ANSWER

Author: anhmtk

backend/api/routers/chat_router.py

@@ -5940,7 +5940,7 @@ def estimate_tokens(text: str) -> int:
                         # Phase 3: Only rewrite when CRITICAL issues are present
                         # Critical issues: missing citation, anthropomorphic language, language mismatch, topic drift, template-like
                         # Non-critical issues (depth, unpacking, style) do NOT trigger rewrite
-                        should_rewrite, rewrite_reason = optimizer.should_rewrite(
+                        should_rewrite, rewrite_reason, max_attempts = optimizer.should_rewrite(
                             quality_result=quality_result,
                             is_philosophical=is_philosophical_non_rag,
                             response_length=len(sanitized_response)
@@ -6262,7 +6262,8 @@ def estimate_tokens(text: str) -> int:
                 response_text=response,
                 context_docs_count=ctx_docs_count
             )
-            logger.info(f"📊 EpistemicState: {epistemic_state.value} (confidence={confidence_score:.2f if confidence_score else 'N/A'}, ctx_docs={ctx_docs_count})")
+            confidence_str = f"{confidence_score:.2f}" if confidence_score else 'N/A'
+            logger.info(f"📊 EpistemicState: {epistemic_state.value} (confidence={confidence_str}, ctx_docs={ctx_docs_count})")
         except Exception as e:
             logger.warning(f"⚠️ Failed to calculate epistemic state: {e}, defaulting to UNKNOWN")
             epistemic_state = EpistemicState.UNKNOWN

backend/core/stillme_detector.py

@@ -477,6 +477,10 @@ def detect_origin_query(query: str) -> Tuple[bool, List[str]]:
         "what is your purpose", "why were you created", "what is your mission",
         "mục tiêu của bạn", "bạn ra đời", "muc tieu cua ban", "ban ra doi",
         "mục đích của bạn", "muc dich cua ban", "nhiệm vụ của bạn", "nhiem vu cua ban",
+        "tổ chức nào", "to chuc nao", "organization", "which organization", "what organization",
+        "công ty nào", "cong ty nao", "company", "which company", "what company",
+        "team nào", "team nao", "which team", "what team",
+        "nhóm nào", "nhom nao", "which group", "what group",
     ]
     for keyword in strong_origin_keywords:
         if keyword in query_lower:
@@ -488,6 +492,16 @@ def detect_origin_query(query: str) -> Tuple[bool, List[str]]:
         matched_keywords.append("who_created_you_pattern")
         return (True, matched_keywords)
 
+    # Check for pattern: "tổ chức/công ty/team/nhóm nào" + "đã tạo ra/tạo ra" + "bạn" (Vietnamese)
+    if re.search(r'\b(tổ chức|to chuc|organization|công ty|cong ty|company|team|nhóm|nhom|group)\s+nào\b.*\b(đã\s+)?(tạo ra|làm ra|xây dựng|phát triển|tao ra|lam ra|xay dung|phat trien)\b.*\b(bạn|ban|stillme|you)\b', query_lower):
+        matched_keywords.append("organization_pattern")
+        return (True, matched_keywords)
+    
+    # Check for pattern: "which/what" + "organization/company/team/group" + "created/built" + "you"
+    if re.search(r'\b(which|what)\s+(organization|company|team|group)\b.*\b(created|built|made|developed|founded)\b.*\b(you|stillme)\b', query_lower):
+        matched_keywords.append("which_organization_pattern")
+        return (True, matched_keywords)
+    
     # Check for pattern: "ai" + "tạo ra/xây dựng" + "bạn" (Vietnamese)
     if re.search(r'\bai\b.*\b(tạo ra|xây dựng|làm ra|phát triển|sáng lập|tao ra|xay dung|lam ra|phat trien|sang lap)\b.*\b(bạn|ban|stillme)\b', query_lower):
         matched_keywords.append("ai_tao_ra_ban_pattern")