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

database/migrations/2026_03_04_112800_extend_address_columns_to_500.php

@@ -0,0 +1,34 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        $tables = ['clients', 'tenants', 'site_briefings', 'sites'];
+
+        foreach ($tables as $table) {
+            if (Schema::hasColumn($table, 'address')) {
+                Schema::table($table, function (Blueprint $t) {
+                    $t->string('address', 500)->nullable()->change();
+                });
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        $tables = ['clients', 'tenants', 'site_briefings', 'sites'];
+
+        foreach ($tables as $table) {
+            if (Schema::hasColumn($table, 'address')) {
+                Schema::table($table, function (Blueprint $t) {
+                    $t->string('address', 255)->nullable()->change();
+                });
+            }
+        }
+    }
+};