feat: FastAPI+SSE API server, JRXML auto-reorder, session integrity fixes

api_server.py

@@ -181,6 +181,13 @@ def _run_graph_sync(agent_state: AgentState, event_q: queue.Queue):
                     for node_state in data.values():
                         if isinstance(node_state, dict):
                             agent_state.update(node_state)
+        # 在 graph 完成后立即保存 session，防止 SSE 流中断导致数据丢失
+        sid = agent_state.get("session_id", "")
+        if sid:
+            try:
+                save_session(sid, agent_state)
+            except Exception:
+                pass  # 静默失败，SSE 流中还有一次保存机会
         event_q.put(("done", {"reason": "graph_completed"}))
     except Exception as exc:
         event_q.put(("error", {
@@ -218,6 +225,8 @@ async def _sse_generator(agent_state: AgentState, session_id: str = "") -> str:
                 total_ms = round((time.time() - t_start) * 1000)
                 if session_id:
                     save_session(session_id, agent_state)
+                versions = agent_state.get("jrxml_versions", [])
+                last_ver = versions[-1] if versions else {}
                 yield _sse_line("agent_complete", {
                     "reason": "done",
                     "intent": agent_state.get("intent", ""),
@@ -228,6 +237,9 @@ async def _sse_generator(agent_state: AgentState, session_id: str = "") -> str:
                     "retry_count": agent_state.get("retry_count", 0),
                     "total_duration_ms": total_ms,
                     "ocr_extraction_result": agent_state.get("ocr_extraction_result", {}),
+                    "versions": len(versions),
+                    "has_failed_version": last_ver.get("status") == "fail" if last_ver else False,
+                    "failed_version_index": len(versions) - 1 if last_ver.get("status") == "fail" else -1,
                 })
                 await future
                 return
@@ -532,7 +544,17 @@ async def chat(session_id: str, payload: dict):
 
     # ── 返回 SSE 流 ──
     async def stream_and_save():
-        final_state = None
+        # 如果上传了附件，先发送处理状态
+        if file_ids:
+            yield _sse_line("node_start", {
+                "node": "process_attachments",
+                "label": "正在处理附件",
+            })
+            yield _sse_line("node_complete", {
+                "node": "process_attachments",
+                "label": "正在处理附件",
+                "detail": f"已解析 {len(file_ids)} 个文件",
+            })
         async for sse_chunk in _sse_generator(agent_state, session_id):
             yield sse_chunk
 
@@ -622,4 +644,4 @@ async def download_file(file_id: str):
 if __name__ == "__main__":
     import uvicorn
     port = int(os.getenv("API_PORT", "8000"))
-    uvicorn.run("api_server:app", host="0.0.0.0", port=port, reload=True)
+    uvicorn.run("api_server:app", host="0.0.0.0", port=port, reload=False)