feat:[interview] AI 대화형 인터뷰 conversations 테이블 및 모델 추가

app/Models/Interview/InterviewAiConversation.php

@@ -0,0 +1,41 @@
+<?php
+
+namespace App\Models\Interview;
+
+use App\Traits\BelongsToTenant;
+use App\Traits\ModelTrait;
+use Illuminate\Database\Eloquent\Model;
+
+class InterviewAiConversation extends Model
+{
+    use BelongsToTenant, ModelTrait;
+
+    const UPDATED_AT = null;
+
+    protected $fillable = [
+        'tenant_id',
+        'interview_session_id',
+        'interview_project_id',
+        'role',
+        'content',
+        'structured_data',
+        'domain',
+        'tokens_used',
+        'model_used',
+    ];
+
+    protected $casts = [
+        'structured_data' => 'array',
+        'tokens_used' => 'integer',
+    ];
+
+    public function session()
+    {
+        return $this->belongsTo(InterviewSession::class, 'interview_session_id');
+    }
+
+    public function project()
+    {
+        return $this->belongsTo(InterviewProject::class, 'interview_project_id');
+    }
+}

database/migrations/2026_03_22_100000_create_interview_ai_conversations_table.php

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+<?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('interview_ai_conversations', function (Blueprint $table) {
+            $table->bigIncrements('id');
+            $table->unsignedBigInteger('tenant_id')->index();
+            $table->unsignedBigInteger('interview_session_id')->nullable()->index();
+            $table->unsignedBigInteger('interview_project_id')->nullable()->index();
+            $table->string('role', 20); // system, user, assistant
+            $table->text('content');
+            $table->json('structured_data')->nullable();
+            $table->string('domain', 50)->nullable();
+            $table->integer('tokens_used')->nullable();
+            $table->string('model_used', 50)->nullable();
+            $table->timestamp('created_at')->useCurrent();
+
+            $table->index(['tenant_id', 'interview_session_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('interview_ai_conversations');
+    }
+};