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/SiteBriefing/UpdateSiteBriefingRequest.php

@@ -29,7 +29,7 @@ public function rules(): array
             'briefing_time' => 'nullable|string|max:10',
             'briefing_type' => ['nullable', 'string', Rule::in(SiteBriefing::TYPES)],
             'location' => 'nullable|string|max:200',
-            'address' => 'nullable|string|max:255',
+            'address' => 'nullable|string|max:500',
 
             // 상태 정보
             'status' => ['nullable', 'string', Rule::in(SiteBriefing::STATUSES)],