feat: Add multi-canvas system with project canvas support

- Add project_canvas and canvas_components tables for persistent canvas storage
- Add ProjectCanvas store with full CRUD operations
- Add ProjectCanvasPage for rendering saved canvas with components
- Add ProjectsPage for managing canvas list (create, clone, delete)
- Add HomePage that loads default canvas or falls back to dynamic canvas
- Add toolbar support for displaying canvas as pages with custom icons
- Add component usage validation to prevent deletion of components in use
- Add MCP tools for canvas management (list, create, update, delete, clone)
- Update router with /canvas/:id and /projects routes
- Update Toolbar to show dynamic canvas pages from database

frontend/src/router/index.ts

@@ -5,9 +5,25 @@ const router = createRouter({
   routes: [
     {
       path: '/',
+      name: 'home',
+      component: () => import('../pages/HomePage.vue')
+    },
+    {
+      path: '/dynamic-canvas',
       name: 'canvas',
       component: () => import('../pages/CanvasPage.vue')
     },
+    {
+      path: '/canvas/:id',
+      name: 'project-canvas',
+      component: () => import('../pages/ProjectCanvasPage.vue'),
+      props: true
+    },
+    {
+      path: '/projects',
+      name: 'projects',
+      component: () => import('../pages/ProjectsPage.vue')
+    },
     {
       path: '/components',
       name: 'components',