feat: lite deep researcher implementation

src/utils/__init__.py

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+"""
+工具函数包
+"""

src/utils/json_utils.py

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+import logging
+import json
+import json_repair
+
+logger = logging.getLogger(__name__)
+
+
+def repair_json_output(content: str) -> str:
+    """
+    Repair and normalize JSON output.
+
+    Args:
+        content (str): String content that may contain JSON
+
+    Returns:
+        str: Repaired JSON string, or original content if not JSON
+    """
+    content = content.strip()
+    if content.startswith(("{", "[")) or "```json" in content or "```ts" in content:
+        try:
+            # If content is wrapped in ```json code block, extract the JSON part
+            if content.startswith("```json"):
+                content = content.removeprefix("```json")
+
+            if content.startswith("```ts"):
+                content = content.removeprefix("```ts")
+
+            if content.endswith("```"):
+                content = content.removesuffix("```")
+
+            # Try to repair and parse JSON
+            repaired_content = json_repair.loads(content)
+            return json.dumps(repaired_content, ensure_ascii=False)
+        except Exception as e:
+            logger.warning(f"JSON repair failed: {e}")
+    return content