fix: add missing think tag

Author: jake-marsden

src/api/models/bedrock.py

@@ -899,6 +899,7 @@ def _create_response_stream(
                     # Port of "signature_delta"
                     if self.think_emitted:
                         message = ChatResponseMessage(content="\n </think> \n\n")
+                        self.think_emitted = False  # Reset flag after closing </think>
                     else:
                         return None  # Ignore signature if no <think> started
             else: