feat: integrate meshservice crate into workspace

- Add meshservice to workspace members
- Fix quicprochat-client: add MeshTrace/MeshStats slash commands
- Add integration test: meshservice_tcp_transport
- Document integration points in README and docs/status.md
- Verify shared identity (IdentityKeypair → MeshAddress)

crates/quicprochat-p2p/Cargo.toml

@@ -43,6 +43,7 @@ humantime-serde  = "1"
 
 [dev-dependencies]
 tempfile = "3"
+meshservice = { path = "../meshservice" }
 
 [[example]]
 name = "fapp_demo"