feat: 添加任务调度器、后台任务运行器及多种工具支持

实现后台任务调度器(scheduler.py)和任务运行器(task_runner.py)，支持长时间运行任务的异步执行和状态跟踪
新增多种工具支持：Shell命令执行、文件操作(读写/搜索/发送)、网页搜索/问答、定时提醒等
扩展README和ROADMAP文档，描述新功能和未来多主机架构规划
在配置文件中添加METASO_API_KEY支持秘塔AI搜索功能
优化代理逻辑，自动识别通用问题直接回答而不创建会话

bot/commands.py

@@ -10,8 +10,10 @@ import uuid
 from typing import Optional, Tuple
 
 from agent.manager import manager
+from agent.scheduler import scheduler
+from agent.task_runner import task_runner
 from orchestrator.agent import agent
-from orchestrator.tools import set_current_user, get_current_user
+from orchestrator.tools import set_current_user, get_current_user, get_current_chat
 
 logger = logging.getLogger(__name__)
 
@@ -59,6 +61,12 @@ async def handle_command(user_id: str, text: str) -> Optional[str]:
         return _cmd_direct(user_id)
     elif cmd == "/smart":
         return _cmd_smart(user_id)
+    elif cmd == "/tasks":
+        return _cmd_tasks()
+    elif cmd == "/shell":
+        return await _cmd_shell(args)
+    elif cmd == "/remind":
+        return await _cmd_remind(args)
     else:
         return None
 
@@ -203,6 +211,73 @@ def _cmd_smart(user_id: str) -> str:
     return "✓ Smart mode ON. Messages go through LLM for intelligent routing."
 
 
+def _cmd_tasks() -> str:
+    """List background tasks."""
+    tasks = task_runner.list_tasks()
+    if not tasks:
+        return "No background tasks."
+
+    lines = ["**Background Tasks:**\n"]
+    for t in tasks:
+        status_emoji = {"completed": "✅", "failed": "❌", "running": "⏳", "pending": "⏸️"}.get(
+            t["status"], "❓"
+        )
+        lines.append(f"{status_emoji} #{t['task_id']} - {t['description'][:50]} ({t['elapsed']}s)")
+    return "\n".join(lines)
+
+
+async def _cmd_shell(args: str) -> str:
+    """Execute a shell command directly."""
+    if not args:
+        return "Usage: /shell <command>\nExample: /shell git status"
+
+    from orchestrator.tools import ShellTool, get_current_chat
+
+    tool = ShellTool()
+    result = await tool._arun(command=args)
+    try:
+        data = json.loads(result)
+        if "error" in data:
+            return f"❌ {data['error']}"
+        output = []
+        if data.get("stdout"):
+            output.append(data["stdout"])
+        if data.get("stderr"):
+            output.append(f"[stderr] {data['stderr']}")
+        output.append(f"[exit code: {data.get('exit_code', '?')}]")
+        return "\n".join(output) if output else "(no output)"
+    except json.JSONDecodeError:
+        return result
+
+
+async def _cmd_remind(args: str) -> str:
+    """Set a reminder."""
+    if not args:
+        return "Usage: /remind <time> <message>\nExample: /remind 10m check the build\nTime format: 30s, 10m, 1h"
+
+    parts = args.split(None, 1)
+    if len(parts) < 2:
+        return "Usage: /remind <time> <message>\nExample: /remind 10m check the build"
+
+    time_str, message = parts
+    match = re.match(r'^(\d+)(s|m|h)$', time_str.lower())
+    if not match:
+        return "Invalid time format. Use: 30s, 10m, 1h"
+
+    value = int(match.group(1))
+    unit = match.group(2)
+    seconds = value * {'s': 1, 'm': 60, 'h': 3600}[unit]
+
+    chat_id = get_current_chat()
+    job_id = await scheduler.schedule_once(
+        delay_seconds=seconds,
+        message=message,
+        notify_chat_id=chat_id,
+    )
+
+    return f"⏰ Reminder #{job_id} set for {value}{unit} from now"
+
+
 def _cmd_help() -> str:
     """Show help."""
     return """**Commands:**
@@ -212,5 +287,8 @@ def _cmd_help() -> str:
 /switch <n> - Switch to session by number
 /direct - Direct mode: messages → Claude Code (no LLM overhead)
 /smart - Smart mode: messages → LLM routing (default)
+/shell <cmd> - Run shell command (bypasses LLM)
+/remind <time> <msg> - Set reminder (e.g. /remind 10m check build)
+/tasks - List background tasks
 /retry - Retry last message
 /help - Show this help"""

bot/handler.py

@@ -15,6 +15,7 @@ from bot.commands import handle_command
 from bot.feishu import send_text
 from config import FEISHU_APP_ID, FEISHU_APP_SECRET, is_user_allowed
 from orchestrator.agent import agent
+from orchestrator.tools import set_current_chat
 
 logger = logging.getLogger(__name__)
 
@@ -87,6 +88,8 @@ def _handle_message(data: P2ImMessageReceiveV1) -> None:
 async def _process_message(user_id: str, chat_id: str, text: str) -> None:
     """Process message: check allowlist, then commands, then agent."""
     try:
+        set_current_chat(chat_id)
+
         if not is_user_allowed(user_id):
             logger.warning("Rejected message from unauthorized user: ...%s", user_id[-8:])
             await send_text(chat_id, "chat_id", "Sorry, you are not authorized to use this bot.")