```

feat(feishu): 添加飞书入站事件inbox和混合数据库协调功能

- 实现飞书入站事件持久化inbox机制，支持状态管理、租约锁定和重试退避
- 添加混合数据库基线协调工具，确保平台PostgreSQL结构安全对齐
- 增加运行组件心跳检测和readiness就绪检查机制
- 实现app_ticket事件的安全轮换和验证处理
- 添加生产环境运行编排和fail-closed安全机制
- 支持webhook快速确认和长连接独立进程处理
- 完善个人数据擦除时的待处理事件清理功能
```

app/modules/feishu_users/identifiers.py

@@ -0,0 +1,20 @@
+from hashlib import sha256
+
+_AUDIT_IDENTITY_DOMAIN = b"company-ai-platform:feishu-audit-identity:v1\0"
+
+
+def feishu_audit_identity_hash(tenant_key: str, open_id: str) -> str:
+    """Return the erasable pseudonymous subject used by pre-registration audits."""
+
+    tenant_bytes = tenant_key.encode("utf-8")
+    open_id_bytes = open_id.encode("utf-8")
+    identity = b"".join(
+        (
+            len(tenant_bytes).to_bytes(4, "big"),
+            tenant_bytes,
+            len(open_id_bytes).to_bytes(4, "big"),
+            open_id_bytes,
+        )
+    )
+    digest = sha256(_AUDIT_IDENTITY_DOMAIN + identity).hexdigest()
+    return f"feishu-identity-sha256-{digest}"