feat:AI 음성녹음 테이블 마이그레이션 및 모델 추가

- ai_voice_recordings 테이블 마이그레이션 생성
- AiVoiceRecording 모델 추가 (Tenants 네임스페이스)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/2026_02_07_200000_create_ai_voice_recordings_table.php

@@ -0,0 +1,37 @@
+<?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
+    {
+        Schema::create('ai_voice_recordings', function (Blueprint $table) {
+            $table->id();
+            $table->unsignedBigInteger('tenant_id')->comment('테넌트 ID');
+            $table->unsignedBigInteger('user_id')->comment('작성자 ID');
+            $table->string('title', 200)->comment('녹음 제목');
+            $table->unsignedBigInteger('interview_template_id')->nullable()->comment('연결된 인터뷰 템플릿 ID');
+            $table->string('audio_file_path', 500)->nullable()->comment('GCS 오브젝트 경로');
+            $table->string('audio_gcs_uri', 500)->nullable()->comment('GCS URI (gs://...)');
+            $table->longText('transcript_text')->nullable()->comment('STT 변환 텍스트');
+            $table->longText('analysis_text')->nullable()->comment('Gemini AI 분석 결과');
+            $table->string('status', 20)->default('PENDING')->comment('상태: PENDING, PROCESSING, COMPLETED, FAILED');
+            $table->unsignedInteger('duration_seconds')->nullable()->comment('녹음 시간(초)');
+            $table->timestamp('file_expiry_date')->nullable()->comment('파일 삭제 예정일');
+            $table->timestamps();
+            $table->softDeletes();
+
+            $table->index('tenant_id');
+            $table->index('user_id');
+            $table->index('status');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('ai_voice_recordings');
+    }
+};