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)

scripts/build_prd.py

@@ -1,7 +0,0 @@
-# -*- coding: utf-8 -*-  
-import os  
-path = r"D:\F\NewI\opencode\daily-workspace\projects\AgentsMeeting\docs\PRD.md"  
-lines = []  
-lines.append("# AgentsMeeting -- PRD v0.1")  
-lines.append("")  
-lines.append("> \u7248\u672c: \u521d\u7a3f ^| \u5ba2\u6237: hmo (\u8001\u83ab) ^| PM: mohe (\u83ab\u8377) ^| \u7814\u53d1: xxm (\u5c0f\u5c0f\u83ab)") 

scripts/gen_prd.py

@@ -1 +0,0 @@
-import os; open(os.path.join(r"D:\F\NewI\opencode\daily-workspace\projects\AgentsMeeting\docs","PRD.md"),"w",encoding="utf-8").write("# AgentsMeeting - PRD v0.1\n\nOK")

scripts/gen_prd_v02.py

@@ -1,2 +0,0 @@
-import os
-print("ok")

scripts/test_echo.py

@@ -1 +0,0 @@
-print("test123")  

scripts/write_prd.py

@@ -1 +0,0 @@
-print("ok")

scripts/write_prd_v02.py

@@ -1,2 +0,0 @@
-import os,sys
-open("D:/F/NewI/opencode/daily-workspace/projects/AgentsMeeting/docs/PRD_v0.2.md","w",encoding="utf-8").write("test ok\n")