Revert "fix: remove duplicate thinking block extraction as payload[4] already contains full formatted reasoning"

This reverts commit 9020ac0acf9c6b5e8b4181f0fd6ad87d24cbaba2.

gemini_web2api.py

@@ -579,6 +579,7 @@ def extract_response_text(raw: str) -> str:
     frames = _scan_complete_wrb_frames(raw)
 
     texts = []
+    think_texts = []
     for elem in frames:
         try:
             if not isinstance(elem, list) or len(elem) < 3 or elem[0] != "wrb.fr":
@@ -588,6 +589,25 @@ def extract_response_text(raw: str) -> str:
                 continue
             payload = json.loads(rp)
             
+            # Extract thinking block (if any)
+            if isinstance(payload, list) and len(payload) > 26 and payload[26]:
+                current_think = []
+                def _extract_think(data):
+                    if isinstance(data, str) and len(data) > 0 and data not in ("python", "text"):
+                        current_think.append(data.strip())
+                    elif isinstance(data, list):
+                        for item in data:
+                            _extract_think(item)
+                    elif isinstance(data, dict):
+                        for k, v in data.items():
+                            if isinstance(v, (list, dict, str)):
+                                _extract_think(v)
+                _extract_think(payload[26])
+                if current_think:
+                    # filter out empty strings and join
+                    filtered_think = [t for t in current_think if t]
+                    think_texts.append("\n\n".join(filtered_think))
+            
             # Extract final text
             if isinstance(payload, list) and len(payload) > 4 and payload[4]:
                 for part in payload[4]:
@@ -606,7 +626,17 @@ def extract_response_text(raw: str) -> str:
             text = t
             break
             
+    # Take the last non-empty thinking text
+    think_text = ""
+    for t in reversed(think_texts):
+        if t.strip():
+            think_text = t
+            break
+            
     final_response = clean_gemini_text(text)
+    if think_text:
+        final_response = f"<think>\n{think_text}\n</think>\n\n{final_response}"
+        
     return final_response