feat(server): add cloudcli service and per-service prebuild flag

Add a CloudCLI (claude-code-ui) service on port 3020, and a prebuild
flag so services backed by a global npm binary skip the Docusaurus-style
`npm run build` step before serve.

mytoolkit/commands/server.py

@@ -23,6 +23,7 @@ class Service:
     project_dir: Optional[Path] = None
     serve_cmd: Optional[list[str]] = None
     dev_cmd: Optional[list[str]] = None
+    prebuild: bool = True  # run `npm run build` before serve (Docusaurus-style)
 
     @property
     def manageable(self) -> bool:
@@ -69,6 +70,14 @@ KNOWN_SERVICES: list[Service] = [
         serve_cmd=["npm", "run", "serve"],
         dev_cmd=["npm", "run", "dev"],
     ),
+    Service(
+        "cloudcli",
+        serve_port=3020,
+        description="CloudCLI (claude-code-ui) web server",
+        project_dir=Path.home() / ".cloudcli",
+        serve_cmd=["cloudcli", "start", "--port", "3020"],
+        prebuild=False,  # global npm binary, no project build step
+    ),
 ]
 
 _BY_NAME: dict[str, Service] = {s.name: s for s in KNOWN_SERVICES}
@@ -268,7 +277,7 @@ def server_start(name, dev, rebuild):
 
     env = no_color_env()
 
-    if not dev:
+    if not dev and svc.prebuild:
         build_dir = svc.project_dir / "build"
         if rebuild or not build_dir.exists():
             reason = "forced rebuild" if rebuild else "build directory missing"