Feat: Hermes PC-Zugriff via MCP (executor + mcp_pc)

- mcp/mcp_pc.py: MCP-Server der PC-Tools an den Executor proxied
  (pc_shell, pc_screenshot, pc_type, pc_key, pc_open, pc_status)
- client/hermes-pc/executor.py: FastAPI auf Port 7777 (Daemon-Reg entfernt)
- client/hermes-pc/start.bat, install.bat, requirements.txt
- client/hermes-voice/agent_client.py, main.py: agent_client integration

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

client/hermes-pc/start.bat

@@ -0,0 +1,9 @@
+@echo off
+cd /d "%~dp0"
+echo === Hermes PC Executor ===
+echo Port: 7777
+echo Hermes (AI Box) kann jetzt auf diesen PC zugreifen.
+echo Fenster offen lassen solange Hermes PC-Zugriff braucht.
+echo.
+.venv\Scripts\python executor.py
+pause