Add 'Detect and Join Conversation' button to Web UI and CLI

- Added /autonomous/join-conversation API endpoint in api.py
- Added 'Detect and Join Conversation' button to Web UI under Autonomous Actions
- Added 'autonomous join-conversation' command to CLI tool (miku-cli.py)
- Updated miku_detect_and_join_conversation_for_server to support force=True parameter
- When force=True: skips time limit, activity checks, and random chance
- Force mode uses last 10 user messages regardless of age
- Manual triggers via Web UI/CLI now work even with old messages

miku-cli.py

@@ -171,6 +171,14 @@ class MikuCLI:
             result = self._post("/autonomous/reaction")
         print(f"✅ {result['message']}")
     
+    def autonomous_join_conversation(self, guild_id: Optional[int] = None):
+        """Trigger detect and join conversation."""
+        if guild_id:
+            result = self._post(f"/autonomous/join-conversation?guild_id={guild_id}")
+        else:
+            result = self._post("/autonomous/join-conversation")
+        print(f"✅ {result['message']}")
+    
     def autonomous_custom(self, prompt: str, guild_id: Optional[int] = None):
         """Send custom autonomous message."""
         if guild_id:
@@ -408,6 +416,7 @@ def print_help():
     autonomous-engage [server_id]   - Engage with conversation
     autonomous-tweet [server_id]    - Post tweet-style message
     autonomous-reaction [server_id] - Generate reaction
+    autonomous-join-conversation [server_id] - Detect and join conversation
     autonomous-custom <prompt> [server_id] - Custom autonomous action
     autonomous-stats                - Show autonomous statistics
     
@@ -489,6 +498,9 @@ def execute_command(cli: MikuCLI, command: str, args: list):
     elif command == 'autonomous-reaction':
         server_id = int(args[0]) if args and args[0].isdigit() else None
         cli.autonomous_reaction(server_id)
+    elif command == 'autonomous-join-conversation':
+        server_id = int(args[0]) if args and args[0].isdigit() else None
+        cli.autonomous_join_conversation(server_id)
     elif command == 'autonomous-custom':
         if not args:
             print("❌ Usage: autonomous-custom <prompt> [server_id]")
@@ -610,7 +622,7 @@ Examples:
     
     # Autonomous commands
     auto_parser = subparsers.add_parser('autonomous', help='Autonomous actions')
-    auto_parser.add_argument('action', choices=['general', 'engage', 'tweet', 'reaction', 'custom', 'stats'])
+    auto_parser.add_argument('action', choices=['general', 'engage', 'tweet', 'reaction', 'join-conversation', 'custom', 'stats'])
     auto_parser.add_argument('--prompt', help='Custom prompt (for custom action)')
     auto_parser.add_argument('--server', type=int, help='Server/guild ID')
     
@@ -702,6 +714,8 @@ Examples:
                 cli.autonomous_tweet(args.server)
             elif args.action == 'reaction':
                 cli.autonomous_reaction(args.server)
+            elif args.action == 'join-conversation':
+                cli.autonomous_join_conversation(args.server)
             elif args.action == 'custom':
                 if not args.prompt:
                     print("❌ --prompt is required for custom action")