feat: 重构资料包模型与会话绑定主链路

apps/chat/migrations/0001_initial.py

@@ -0,0 +1,52 @@
+# Generated by Django 5.2.14 on 2026-06-03 16:39
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = []
+
+    operations = [
+        migrations.CreateModel(
+            name="Conversation",
+            fields=[
+                (
+                    "id",
+                    models.BigAutoField(
+                        auto_created=True,
+                        primary_key=True,
+                        serialize=False,
+                        verbose_name="ID",
+                    ),
+                ),
+                (
+                    "conversation_id",
+                    models.CharField(db_index=True, max_length=64, unique=True),
+                ),
+                ("title", models.CharField(max_length=255)),
+                (
+                    "product_name",
+                    models.CharField(blank=True, db_index=True, max_length=255),
+                ),
+                (
+                    "batch_id",
+                    models.CharField(blank=True, db_index=True, max_length=64),
+                ),
+                (
+                    "task_status",
+                    models.CharField(db_index=True, default="pending", max_length=32),
+                ),
+                ("node_results", models.JSONField(blank=True, default=list)),
+                ("latest_summary", models.JSONField(blank=True, default=dict)),
+                ("created_at", models.DateTimeField(auto_now_add=True, db_index=True)),
+                ("updated_at", models.DateTimeField(auto_now=True)),
+                ("last_run_at", models.DateTimeField(blank=True, null=True)),
+            ],
+            options={
+                "ordering": ["-updated_at", "-created_at"],
+            },
+        ),
+    ]