fix: [address] 주소 필드 255자 → 500자 확장

- DB 마이그레이션: clients, tenants, site_briefings, sites 테이블 address 컬럼 varchar(500)
- FormRequest 8개 파일 max:255 → max:500 변경

app/Http/Requests/Tenant/TenantStoreRequest.php

@@ -17,7 +17,7 @@ public function rules(): array
             'company_name' => 'required|string|max:100',
             'email' => 'nullable|email|max:100',
             'phone' => 'nullable|string|max:20',
-            'address' => 'nullable|string|max:255',
+            'address' => 'nullable|string|max:500',
             'business_num' => 'nullable|string|max:20',
             'ceo_name' => 'nullable|string|max:100',
         ];