reset to setup module state

Remove Task Manager implementation to match `# Setup module` in module.md.
Backend src/ reduced to Kernel.php + empty Entity/, all migrations deleted,
database dropped and recreated. Frontend components/views/services/stores
removed, App.vue/router/style.css reduced to skeletons. CLAUDE.md shortened
to Setup-stand. Old backend/plan.md, plan2.md removed.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/router/index.js

@@ -1,46 +1,8 @@
 import { createRouter, createWebHistory } from 'vue-router'
-import HomeView from '../views/HomeView.vue'
 
 const router = createRouter({
   history: createWebHistory(),
-  routes: [
-    {
-      path: '/',
-      name: 'home',
-      component: HomeView,
-      meta: { breadcrumb: [] },
-    },
-    {
-      path: '/tasks/all',
-      name: 'tasks-all',
-      component: () => import('../views/AllTasksView.vue'),
-      meta: { breadcrumb: [{ label: 'Übersicht' }] },
-    },
-    {
-      path: '/tasks/new',
-      name: 'schema-create',
-      component: () => import('../views/SchemaView.vue'),
-      meta: { breadcrumb: [{ label: 'Übersicht', to: '/tasks/all' }, { label: 'Neue Aufgabe' }] },
-    },
-    {
-      path: '/tasks/:id',
-      name: 'task-detail',
-      component: () => import('../views/TaskDetailView.vue'),
-      meta: { breadcrumb: [{ label: 'Übersicht', to: '/tasks/all' }, { label: '', dynamic: true }] },
-    },
-    {
-      path: '/schemas/:id',
-      name: 'schema-detail',
-      component: () => import('../views/SchemaView.vue'),
-      meta: { breadcrumb: [{ label: 'Übersicht', to: '/tasks/all' }, { label: '', dynamic: true }] },
-    },
-    {
-      path: '/categories',
-      name: 'categories',
-      component: () => import('../views/CategoriesView.vue'),
-      meta: { breadcrumb: [{ label: 'Kategorien' }] },
-    },
-  ],
+  routes: [],
 })
 
 export default router