docs(guide): rewrite CLAUDE.md with ZCLAW-first perspective

Major changes:
- Shift from "OpenFang desktop client" to "independent AI Agent desktop app"
- Add decision principle: "Is this useful for ZCLAW? Does it affect ZCLAW?"
- Simplify project structure and tech stack sections
- Replace OpenClaw vs OpenFang comparison with unified backend approach
- Consolidate troubleshooting from scattered sections into organized FAQ
- Update Hands system documentation with 8 capabilities and status
- Stream

config/config.toml

@@ -18,12 +18,12 @@
 # ============================================================
 
 [server]
-# gRPC server host and port
+# gRPC server host and port (default 4200 from runtime-manifest.json)
 host = "127.0.0.1"
-port = 50051
+port = 4200
 
 # WebSocket configuration
-websocket_port = 50051
+websocket_port = 4200
 websocket_path = "/ws"
 
 # CORS settings for desktop client