feat(命令): 添加直接模式和智能模式切换功能

- 在 OrchestrationAgent 中添加 passthrough 状态管理
- 新增 /direct 和 /smart 命令用于切换模式
- 修改 /list 命令为 /status 并显示当前模式状态
- 更新帮助信息包含新模式命令

bot/commands.py

@@ -45,8 +45,8 @@ async def handle_command(user_id: str, text: str) -> Optional[str]:
 
     if cmd in ("/new", "/n"):
         return await _cmd_new(user_id, args)
-    elif cmd in ("/list", "/ls", "/l"):
-        return await _cmd_list(user_id)
+    elif cmd in ("/status", "/list", "/ls", "/l"):
+        return await _cmd_status(user_id)
     elif cmd in ("/close", "/c"):
         return await _cmd_close(user_id, args)
     elif cmd in ("/switch", "/s"):
@@ -55,6 +55,10 @@ async def handle_command(user_id: str, text: str) -> Optional[str]:
         return await _cmd_retry(user_id)
     elif cmd in ("/help", "/h", "/?"):
         return _cmd_help()
+    elif cmd == "/direct":
+        return _cmd_direct(user_id)
+    elif cmd == "/smart":
+        return _cmd_smart(user_id)
     else:
         return None
 
@@ -107,18 +111,22 @@ async def _cmd_new(user_id: str, args: str) -> str:
         return result
 
 
-async def _cmd_list(user_id: str) -> str:
-    """List all sessions for this user."""
+async def _cmd_status(user_id: str) -> str:
+    """Show status: sessions and current mode."""
     sessions = manager.list_sessions(user_id=user_id)
     if not sessions:
         return "No active sessions."
 
     active = agent.get_active_conv(user_id)
+    passthrough = agent.get_passthrough(user_id)
     lines = ["**Your Sessions:**\n"]
     for i, s in enumerate(sessions, 1):
         marker = "→ " if s["conv_id"] == active else "  "
         lines.append(f"{marker}{i}. `{s['conv_id']}` - `{s['cwd']}`")
-    lines.append("\nUse `/switch <n>` to activate a session.")
+    status = "Direct 🟢" if passthrough else "Smart ⚪"
+    lines.append(f"\n**Mode:** {status}")
+    lines.append("Use `/switch <n>` to activate a session.")
+    lines.append("Use `/direct` or `/smart` to change mode.")
     return "\n".join(lines)
 
 
@@ -161,7 +169,7 @@ async def _cmd_switch(user_id: str, args: str) -> str:
         return "No sessions available."
 
     if not args:
-        return "Usage: /switch <n>\n" + await _cmd_list(user_id)
+        return "Usage: /switch <n>\n" + await _cmd_status(user_id)
 
     try:
         idx = int(args) - 1
@@ -180,12 +188,29 @@ async def _cmd_retry(user_id: str) -> str:
     return "Retry not yet implemented. Just send your message again."
 
 
+def _cmd_direct(user_id: str) -> str:
+    """Enable direct mode - messages go straight to Claude Code."""
+    conv = agent.get_active_conv(user_id)
+    if not conv:
+        return "No active session. Use `/new` or `/switch` first."
+    agent.set_passthrough(user_id, True)
+    return f"✓ Direct mode ON. Messages go directly to session `{conv}`."
+
+
+def _cmd_smart(user_id: str) -> str:
+    """Enable smart mode - messages go through LLM for routing."""
+    agent.set_passthrough(user_id, False)
+    return "✓ Smart mode ON. Messages go through LLM for intelligent routing."
+
+
 def _cmd_help() -> str:
     """Show help."""
     return """**Commands:**
 /new <dir> [msg] [--timeout N] [--idle N] - Create session
-/list - List your sessions
+/status - Show sessions and current mode
 /close [n] - Close session (active or by number)
 /switch <n> - Switch to session by number
+/direct - Direct mode: messages → Claude Code (no LLM overhead)
+/smart - Smart mode: messages → LLM routing (default)
 /retry - Retry last message
 /help - Show this help"""

orchestrator/agent.py

@@ -74,6 +74,8 @@ class OrchestrationAgent:
         self._active_conv: Dict[str, Optional[str]] = defaultdict(lambda: None)
         # user_id -> asyncio.Lock (prevents concurrent processing per user)
         self._user_locks: Dict[str, asyncio.Lock] = defaultdict(asyncio.Lock)
+        # user_id -> passthrough mode enabled
+        self._passthrough: Dict[str, bool] = defaultdict(lambda: False)
 
     def _build_system_prompt(self, user_id: str) -> str:
         conv_id = self._active_conv[user_id]
@@ -89,6 +91,12 @@ class OrchestrationAgent:
     def get_active_conv(self, user_id: str) -> Optional[str]:
         return self._active_conv.get(user_id)
 
+    def get_passthrough(self, user_id: str) -> bool:
+        return self._passthrough.get(user_id, False)
+
+    def set_passthrough(self, user_id: str, enabled: bool) -> None:
+        self._passthrough[user_id] = enabled
+
     async def run(self, user_id: str, text: str) -> str:
         """Process a user message and return the agent's reply."""
         async with self._user_locks[user_id]:
@@ -102,8 +110,8 @@ class OrchestrationAgent:
         logger.info(">>> user=...%s  conv=%s  msg=%r", short_uid, active_conv, text[:80])
         logger.debug("    history_len=%d", len(self._history[user_id]))
 
-        # Passthrough mode: if active session, bypass LLM (bot commands handled earlier)
-        if active_conv:
+        # Passthrough mode: if enabled and active session, bypass LLM
+        if self._passthrough[user_id] and active_conv:
             try:
                 reply = await manager.send(active_conv, text, user_id=user_id)
                 logger.info("<<< [passthrough] reply: %r", reply[:120])