feat: clients.is_active CHAR(1) → TINYINT(1) Boolean 마이그레이션

- DB: CHAR(1) 'Y'/'N' → TINYINT(1) 0/1 컬럼 타입 변경
- Model: boolean 캐스트 추가, scopeActive() 수정
- Service: toggle(), index() Boolean 로직 적용
- FormRequest: 'in:Y,N' → 'boolean' 검증 규칙 변경
- Swagger: is_active type string → boolean 변경

database/migrations/2025_12_08_200913_convert_clients_is_active_to_boolean.php

@@ -0,0 +1,42 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * clients 테이블 is_active 컬럼을 CHAR(1) 'Y'/'N'에서 TINYINT(1) 0/1로 변환
+ *
+ * 프로젝트 표준:
+ * - DB: tinyint(1) with 0/1
+ * - Model: 'is_active' => 'boolean' cast
+ * - API: true/false
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // 1. 'Y' → 1, 'N' → 0 으로 데이터 변환 (임시로 숫자 문자열)
+        DB::statement("UPDATE clients SET is_active = '1' WHERE is_active = 'Y'");
+        DB::statement("UPDATE clients SET is_active = '0' WHERE is_active = 'N' OR is_active = '' OR is_active IS NULL");
+
+        // 2. 컬럼 타입 변경: CHAR(1) → TINYINT(1)
+        DB::statement("
+            ALTER TABLE clients
+            MODIFY COLUMN is_active TINYINT(1) NOT NULL DEFAULT 1 COMMENT '활성여부(1=활성,0=비활성)'
+        ");
+    }
+
+    public function down(): void
+    {
+        // 1. 컬럼 타입 복구: TINYINT(1) → CHAR(1)
+        DB::statement("
+            ALTER TABLE clients
+            MODIFY COLUMN is_active CHAR(1) NOT NULL DEFAULT 'Y' COMMENT '활성여부(Y/N)'
+        ");
+
+        // 2. 1 → 'Y', 0 → 'N' 으로 데이터 복구
+        DB::statement("UPDATE clients SET is_active = 'Y' WHERE is_active = '1' OR is_active = 1");
+        DB::statement("UPDATE clients SET is_active = 'N' WHERE is_active = '0' OR is_active = 0");
+    }
+};