Implement plugin dynamic settings routes architecture

Plugins can now register their settings pages dynamically via get_settings_routes()
hook, eliminating hardcoded imports that break lean builds.

Backend:
- Add get_settings_routes() hook to BasePlugin (shopdb/plugins/base.py)
- Implement in ComputersPlugin for Operating Systems management
- Add /api/plugins/settings-routes endpoint to expose plugin routes

Frontend:
- ModelCatalogHub fetches plugin routes and dynamically adds them via router.addRoute()
- Tabs render dynamically from pluginTabs ref
- Components lazy-load when clicked

Benefits:
- Lean builds work without manual route exclusions
- Plugins self-contain their UI extensions
- No core code changes needed when adding plugin settings pages
- Follows plugin architecture best practices

Fixes TODO from commit a03fd3de4f

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

shopdb/core/api/plugins.py

@@ -42,6 +42,30 @@ def list_enabled_plugins():
     return success_response(sorted(names))
 
 
+@plugins_bp.route('/settings-routes', methods=['GET'])
+@jwt_required(optional=True)
+def get_plugin_settings_routes():
+    """Return settings routes contributed by all enabled plugins.
+
+    Plugins can register routes to add tabs/pages to settings hubs like
+    Model Catalog, Asset Config, etc. Frontend router merges these dynamically.
+
+    Returns: { routes: [{hub, path, name, tab, component}, ...] }
+    """
+    pm = current_app.extensions.get('plugin_manager')
+    if not pm:
+        return success_response({'routes': []})
+
+    routes = []
+    for plugin in pm.get_enabled_plugin_instances():
+        if hasattr(plugin, 'get_settings_routes'):
+            plugin_routes = plugin.get_settings_routes()
+            if plugin_routes:
+                routes.extend(plugin_routes)
+
+    return success_response({'routes': routes})
+
+
 @plugins_bp.route('/<name>', methods=['PUT'])
 @jwt_required()
 @require_role('admin')

shopdb/plugins/base.py

@@ -129,6 +129,30 @@ class BasePlugin(ABC):
         """
         return []
 
+    def get_settings_routes(self) -> List[Dict]:
+        """Frontend routes this plugin adds to settings pages.
+
+        Returns a list of route configurations for the plugin's settings pages.
+        Each route is a dict with:
+          hub      - settings hub to attach to ('model-catalog', 'asset-config', etc.)
+          path     - route path relative to hub (e.g. 'operatingsystems')
+          name     - unique route name (e.g. 'model-catalog-os')
+          tab      - tab label shown in hub UI (e.g. 'Operating Systems')
+          component- path to Vue component (e.g. 'plugins/<name>/frontend/views/<Component>.vue')
+
+        Example:
+          return [{
+            'hub': 'model-catalog',
+            'path': 'operatingsystems',
+            'name': 'model-catalog-os',
+            'tab': 'Operating Systems',
+            'component': 'plugins/computers/frontend/views/OperatingSystemsList.vue'
+          }]
+
+        Return [] (default) if the plugin adds no settings pages.
+        """
+        return []
+
     def get_settings_defaults(self) -> List[Dict]:
         """Declare the Setting rows this plugin owns.