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>

backend/src/Repository/TaskSchemaRepository.php

@@ -1,38 +0,0 @@
-<?php
-
-namespace App\Repository;
-
-use App\Entity\TaskSchema;
-use App\Enum\TaskSchemaStatus;
-use App\Enum\TaskSchemaType;
-use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
-use Doctrine\Persistence\ManagerRegistry;
-
-/**
- * @extends ServiceEntityRepository<TaskSchema>
- */
-class TaskSchemaRepository extends ServiceEntityRepository
-{
-    public function __construct(ManagerRegistry $registry)
-    {
-        parent::__construct($registry, TaskSchema::class);
-    }
-
-    /**
-     * @return TaskSchema[]
-     */
-    public function findActiveSchemasInRange(\DateTimeInterface $from, \DateTimeInterface $to): array
-    {
-        return $this->createQueryBuilder('t')
-            ->where('t.status = :active')
-            ->andWhere('t.taskType IN (:types)')
-            ->andWhere('t.startDate <= :to')
-            ->andWhere('t.endDate IS NULL OR t.endDate >= :from')
-            ->setParameter('active', TaskSchemaStatus::Active)
-            ->setParameter('types', [TaskSchemaType::Daily, TaskSchemaType::Custom])
-            ->setParameter('from', $from)
-            ->setParameter('to', $to)
-            ->getQuery()
-            ->getResult();
-    }
-}