Add Linker and Optimizer modules with API integration and frontend components

- Added Linker and Optimizer apps to `INSTALLED_APPS` in `settings.py`.
- Configured API endpoints for Linker and Optimizer in `urls.py`.
- Implemented `OptimizeContentFunction` for content optimization in the AI module.
- Created prompts for content optimization and site structure generation.
- Updated `OptimizerService` to utilize the new AI function for content optimization.
- Developed frontend components including dashboards and content lists for Linker and Optimizer.
- Integrated new routes and sidebar navigation for Linker and Optimizer in the frontend.
- Enhanced content management with source and sync status filters in the Writer module.
- Comprehensive test coverage added for new features and components.

frontend/src/layout/AppSidebar.tsx

@@ -134,6 +134,30 @@ const AppSidebar: React.FC = () => {
       });
     }
     
+    // Add Linker if enabled
+    if (moduleEnabled('linker')) {
+      workflowItems.push({
+        icon: <PlugInIcon />,
+        name: "Linker",
+        subItems: [
+          { name: "Dashboard", path: "/linker" },
+          { name: "Content", path: "/linker/content" },
+        ],
+      });
+    }
+    
+    // Add Optimizer if enabled
+    if (moduleEnabled('optimizer')) {
+      workflowItems.push({
+        icon: <BoltIcon />,
+        name: "Optimizer",
+        subItems: [
+          { name: "Dashboard", path: "/optimizer" },
+          { name: "Content", path: "/optimizer/content" },
+        ],
+      });
+    }
+    
     // Add Automation if enabled
     if (moduleEnabled('automation')) {
       workflowItems.push({