docs: 更新命令前缀从/改为//

更新所有文档和代码中的命令前缀，从单斜杠`/`改为双斜杠`//`，以保持一致性

bot/commands.py

@@ -202,8 +202,8 @@ async def _cmd_status(user_id: str) -> str:
         perm = _perm_label(s.get("permission_mode", DEFAULT_PERMISSION_MODE))
         lines.append(f"{marker}{i}. `{s['conv_id']}` - `{s['cwd']}` [{perm}]")
     lines.append(f"\n**Mode:** {mode}")
-    lines.append("Use `/switch <n>` to activate a session.")
-    lines.append("Use `/direct` or `/smart` to change mode.")
+    lines.append("Use `//switch <n>` to activate a session.")
+    lines.append("Use `//direct` or `//smart` to change mode.")
     return "\n".join(lines)
 
 
@@ -247,7 +247,7 @@ async def _cmd_close(user_id: str, args: str) -> str:
     else:
         conv_id = agent.get_active_conv(user_id)
         if not conv_id:
-            return "No active session. Use `/close <conv_id>` or `/close <n>`."
+            return "No active session. Use `//close <conv_id>` or `//close <n>`."
 
     try:
         success = await manager.close(conv_id, user_id=user_id)
@@ -302,7 +302,7 @@ async def _cmd_perm(user_id: str, args: str) -> str:
         return f"Unknown mode '{alias}'. Valid: bypass, accept, plan"
 
     if not conv_id:
-        return "No active session. Use `/perm <mode> <conv_id>` or activate a session first."
+        return "No active session. Use `//perm <mode> <conv_id>` or activate a session first."
 
     try:
         manager.set_permission_mode(conv_id, permission_mode, user_id=user_id)
@@ -323,7 +323,7 @@ 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."
+        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}`."
 
@@ -430,7 +430,7 @@ async def _cmd_nodes(user_id: str, args: str) -> str:
         marker = "→ " if n["node_id"] == active_node_id else "  "
         status = "🟢" if n["status"] == "online" else "🔴"
         lines.append(f"{marker}{n['display_name']} {status}  sessions={n['sessions']}")
-    lines.append("\nUse `/node <name>` to switch active node.")
+    lines.append("\nUse `//node <name>` to switch active node.")
     return "\n".join(lines)