fix(mobile): wire plugin catalog and session-scoped subagent controls

hermes_cli/web_models.py

@@ -747,9 +747,11 @@ class FontSetBody(BaseModel):
 # --- from web_server.py (originally lines 19681-19684) ---
 
 class _AgentPluginInstallBody(BaseModel):
-    identifier: str
+    identifier: str = ""
     force: bool = False
     enable: bool = True
+    catalog_name: Optional[str] = None
+    ref: Optional[str] = None
 
 
 # --- from web_server.py (originally lines 19896-19898) ---
@@ -763,4 +765,3 @@ class _PluginProvidersPutBody(BaseModel):
 
 class _PluginVisibilityBody(BaseModel):
     hidden: bool
-