feat: 重构资料包模型与会话绑定主链路

apps/chat/models.py

@@ -0,0 +1,34 @@
+from django.db import models
+
+
+class Conversation(models.Model):
+    """
+    审核智能体会话主对象。
+
+    会话与资料包一一绑定，标题默认使用解析出的产品名称，
+    节点结果使用 JSON 挂载，便于页面按节点展示。
+    """
+
+    STATUS_PENDING = "pending"
+    STATUS_PROCESSING = "processing"
+    STATUS_COMPLETED = "completed"
+    STATUS_REVIEW_REQUIRED = "review_required"
+    STATUS_BLOCKED = "blocked"
+    STATUS_FAILED = "failed"
+
+    conversation_id = models.CharField(max_length=64, unique=True, db_index=True)
+    title = models.CharField(max_length=255)
+    product_name = models.CharField(max_length=255, blank=True, db_index=True)
+    batch_id = models.CharField(max_length=64, blank=True, db_index=True)
+    task_status = models.CharField(max_length=32, default=STATUS_PENDING, db_index=True)
+    node_results = models.JSONField(default=list, blank=True)
+    latest_summary = models.JSONField(default=dict, blank=True)
+    created_at = models.DateTimeField(auto_now_add=True, db_index=True)
+    updated_at = models.DateTimeField(auto_now=True)
+    last_run_at = models.DateTimeField(null=True, blank=True)
+
+    class Meta:
+        ordering = ["-updated_at", "-created_at"]
+
+    def __str__(self) -> str:
+        return self.title