refactor(xxm): consolidate 4 bot implementations into unified xmpp_agent_core.py

- Merge bot_base.py, gateway/scripts/xmpp_bot.py, bots/*, xmpp_bot_rest.py
  into single xmpp_agent_core.py with --agent flag (xxm|mohe|zhiwei|xiaoguo)
- Add xxm_bot.py wrapper (encoding=utf-8 for Windows exec)
- Fix slixmpp connect() API: use host=/port= keyword args (was tuple)
- Clean up orphans: bots/, scripts/, hermes_state.py, xmpp_bot.py, xmpp_bot_rest.py
- Add docs/CLEANUP_PLAN.md documenting the migration
- Update README.md project structure
- Also: fix WeChat agent path resolution (relative paths)

gateway/scripts/xmpp_bot.py

@@ -26,8 +26,8 @@ if not _lock.ok:
 # ── Config ──
 JID = "xxm@yoin.fun"
 PASSWORD = "hermes123"
-SERVER = "xmpp.yoin.fun"
-PORT = 3021
+SERVER = "192.168.1.246"
+PORT = 5222
 ATTACH_SESSION = "ses_xxm_xmpp"
 MUC_ROOMS = [
     "coregroup@conference.yoin.fun",  # core group chat
@@ -696,23 +696,22 @@ if __name__ == "__main__":
             bot_nick = JID.split("@")[0]
             async def _join_silent():
                 for room_jid in MUC_ROOMS:
-                    for attempt in range(3):
-                        try:
-                            # Use join_muc_wait to ensure room join completes
-                            await self.plugin['xep_0045'].join_muc_wait(room_jid, bot_nick, timeout=60)
-                            log(f"Joined {room_jid} (silent)")
-                            break
-                        except asyncio.TimeoutError:
-                            log(f"MUC join timeout ({attempt+1}/3) for {room_jid}")
-                            if attempt == 2:
-                                log(f"MUC setup failed for {room_jid} after 3 attempts")
-                                await asyncio.sleep(5)
-                            else:
-                                await asyncio.sleep(3)
-                        except Exception as e:
-                            log(f"MUC setup failed for {room_jid}: {e} (type={type(e).__name__})")
-                            await asyncio.sleep(5)
-                            break
+                    nick = bot_nick
+                    try:
+                        # Use join_muc (non-waiting) to register plugin state
+                        self.plugin['xep_0045'].join_muc(room_jid, nick)
+                        # Also send raw presence as backup
+                        presence = (
+                            f"<presence to='{room_jid}/{nick}'>"
+                            f"<x xmlns='http://jabber.org/protocol/muc'>"
+                            f"<history maxstanzas='0'/>"
+                            f"</x></presence>"
+                        )
+                        self.send_raw(presence)
+                        log(f"Joined {room_jid} (async)")
+                    except Exception as e:
+                        log(f"MUC join failed for {room_jid}: {type(e).__name__}: {e}")
+                    await asyncio.sleep(2)
                 # After joining, query MAM for recent history
                 await asyncio.sleep(3)  # wait for MUC join to propagate
                 await _fetch_mam_history()