feat: 增强 core/agents 工具和 API

- 新增 loop.py Agent 运行循环
- 优化 memory.py 记忆模块
- 扩展 api/routes.py 接口
- 更新 tools 模块：builtin.py, manager.py, __init__.py
- 新增 .env.example 配置示例
- 更新 requirements.txt 依赖

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

core/agents/agent/memory.py

@@ -537,8 +537,25 @@ class AgentMemory:
             except:
                 pass
 
+        # Check if content contains tool_calls or tool_result markers
         # Format as Markdown (产品经理指定格式)
-        entry = f"## 消息 {msg_count}\n角色: {role}\n时间: {display_timestamp}\n内容: {content}\n\n"
+        entry_lines = [
+            f"## 消息 {msg_count}",
+            f"角色: {role}",
+            f"时间: {display_timestamp}",
+        ]
+
+        # Handle tool_calls and tool_result content
+        if content.startswith("[tool_calls]"):
+            entry_lines.append(f"工具调用: {content[len('[tool_calls]'):]}")
+            entry_lines.append(f"内容: ")
+        elif content.startswith("[tool_result]"):
+            entry_lines.append(f"工具结果: {content[len('[tool_result]'):]}")
+            entry_lines.append(f"内容: ")
+        else:
+            entry_lines.append(f"内容: {content}")
+
+        entry = "\n".join(entry_lines) + "\n\n"
 
         with open(session_file, "a", encoding="utf-8") as f:
             if header:
@@ -610,6 +627,27 @@ class AgentMemory:
                     current_message["timestamp"] = line.split(":", 1)[1].strip()
                     continue
 
+                # Parse "工具调用: xxx" - for tool_calls
+                if line.startswith("工具调用:") and current_message is not None:
+                    tool_calls_json = line.split(":", 1)[1].strip()
+                    try:
+                        current_message["tool_calls"] = json.loads(tool_calls_json)
+                    except json.JSONDecodeError:
+                        pass
+                    continue
+
+                # Parse "工具结果: xxx" - for tool_result
+                if line.startswith("工具结果:") and current_message is not None:
+                    tool_result_json = line.split(":", 1)[1].strip()
+                    try:
+                        tool_result = json.loads(tool_result_json)
+                        current_message["tool_call_id"] = tool_result.get("tool_call_id", "")
+                        current_message["name"] = tool_result.get("name", "")
+                        current_message["content"] = tool_result.get("content", "")
+                    except json.JSONDecodeError:
+                        pass
+                    continue
+
                 # Parse "内容: xxx"
                 if line.startswith("内容:") and current_message is not None:
                     current_message["content"] = line.split(":", 1)[1].strip()
@@ -617,7 +655,7 @@ class AgentMemory:
 
                 # Content line
                 if current_message:
-                    if current_message["content"]:
+                    if current_message.get("content"):
                         current_message["content"] += "\n" + line
                     else:
                         current_message["content"] = line