feat: enforce checklist/minibar completion before marking task done

- ApiError now carries errors[] array from 422 responses
- updateStatus re-throws 422 so TaskCard can surface errors
- TaskCard: minibarCheckedLocal state + 'Подтвердить проверку минибара' button
- TaskCard: async handleComplete with completionErrors display
- Backend validation errors shown inline in completion panel

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/routes/housekeeping.ts

@@ -159,7 +159,67 @@ const housekeeping: FastifyPluginAsync = async (fastify) => {
         updates.push(`completed_at = NULL`)
       }
 
+      // Also allow updating minibar_checked flag
+      if ((request.body as Record<string, unknown>).minibar_checked !== undefined) {
+        updates.push(`minibar_checked = $${idx}`)
+        values.push((request.body as Record<string, unknown>).minibar_checked)
+        idx++
+      }
+
       if (updates.length === 0) return reply.code(400).send({ error: 'Nothing to update' })
+
+      // ── Validate completion requirements ──────────────────────────────────
+      if (request.body.status === 'done') {
+        // Get current task (need task_type, minibar_checked, room_id)
+        const { rows: taskRows } = await db.query(
+          `SELECT t.*, t.minibar_checked FROM housekeeping_tasks t WHERE t.id = $1 AND t.hotel_id = $2`,
+          [id, hotelId],
+        )
+        const currentTask = taskRows[0]
+        if (!currentTask) return reply.code(404).send({ error: 'Task not found' })
+
+        // Merge minibar_checked from request body (may be set in same request)
+        const minibarCheckedNow = (request.body as Record<string, unknown>).minibar_checked ?? currentTask.minibar_checked
+
+        const errors: string[] = []
+
+        // 1. Check checklist requirements
+        const { rows: templates } = await db.query(
+          `SELECT id, name FROM checklist_templates
+            WHERE hotel_id = $1 AND is_active = true AND require_before_complete = true
+              AND (task_type IS NULL OR task_type = $2)`,
+          [hotelId, currentTask.type ?? null],
+        )
+
+        for (const tpl of templates) {
+          const { rows: items } = await db.query(
+            `SELECT ci.id, ci.text,
+                    cc.id IS NOT NULL AS is_completed
+               FROM checklist_items ci
+               LEFT JOIN checklist_completions cc ON cc.item_id = ci.id AND cc.task_id = $1
+              WHERE ci.template_id = $2
+              ORDER BY ci.sort_order`,
+            [id, tpl.id],
+          )
+          const unchecked = items.filter((i: Record<string, unknown>) => !i.is_completed)
+          if (unchecked.length > 0) {
+            errors.push(`Чек-лист «${tpl.name}»: не выполнено ${unchecked.length} из ${items.length} пунктов`)
+          }
+        }
+
+        // 2. Check minibar requirement
+        const { rows: rules } = await db.query(
+          `SELECT require_minibar_check FROM hotel_housekeeping_rules WHERE hotel_id = $1`,
+          [hotelId],
+        )
+        if (rules[0]?.require_minibar_check && !minibarCheckedNow) {
+          errors.push('Минибар не проверен')
+        }
+
+        if (errors.length > 0) {
+          return reply.code(422).send({ error: errors.join('; '), errors })
+        }
+      }
       values.push(id, hotelId)
 
       const { rows: updated } = await db.query(