feat: PM 이슈에 팀/담당자/고객사 필드 추가

- department_id, team: 부서 (하이브리드 FK + 문자열)
- assignee_id, assignee_name: 담당자 (하이브리드)
- client: 고객사명 (문자열)

database/migrations/2025_12_02_183031_add_team_assignee_client_fields_to_admin_pm_issues_table.php

@@ -0,0 +1,80 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     *
+     * admin_pm_issues 테이블에 팀/담당자/고객사 필드 추가
+     * - 하이브리드 방식: FK + 문자열 필드 (연동 선택 가능)
+     */
+    public function up(): void
+    {
+        Schema::table('admin_pm_issues', function (Blueprint $table) {
+            // 부서 (하이브리드: FK 또는 문자열)
+            $table->foreignId('department_id')
+                ->nullable()
+                ->after('is_urgent')
+                ->constrained('departments')
+                ->nullOnDelete()
+                ->comment('부서 FK (연동 시)');
+            $table->string('team', 100)
+                ->nullable()
+                ->after('department_id')
+                ->comment('팀/부서명 (직접 입력)');
+
+            // 담당자 (하이브리드: FK 또는 문자열)
+            $table->foreignId('assignee_id')
+                ->nullable()
+                ->after('team')
+                ->constrained('users')
+                ->nullOnDelete()
+                ->comment('담당자 FK (연동 시)');
+            $table->string('assignee_name', 100)
+                ->nullable()
+                ->after('assignee_id')
+                ->comment('담당자명 (직접 입력)');
+
+            // 고객사
+            $table->string('client', 100)
+                ->nullable()
+                ->after('assignee_name')
+                ->comment('고객사명');
+
+            // 인덱스
+            $table->index('department_id', 'idx_admin_pm_issues_department');
+            $table->index('assignee_id', 'idx_admin_pm_issues_assignee');
+            $table->index('client', 'idx_admin_pm_issues_client');
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('admin_pm_issues', function (Blueprint $table) {
+            // 인덱스 삭제
+            $table->dropIndex('idx_admin_pm_issues_department');
+            $table->dropIndex('idx_admin_pm_issues_assignee');
+            $table->dropIndex('idx_admin_pm_issues_client');
+
+            // FK 삭제
+            $table->dropForeign(['department_id']);
+            $table->dropForeign(['assignee_id']);
+
+            // 컬럼 삭제
+            $table->dropColumn([
+                'department_id',
+                'team',
+                'assignee_id',
+                'assignee_name',
+                'client',
+            ]);
+        });
+    }
+};