fix(test): watch bottleneck attribution — distinguish server vs local

When wait > 300s, now checks:
- Active TCP connections at connect() return → server-side long-poll
- No connections + network_sent ≈ 0 → local blocking (checkpoint/reconcile/schema)

Previous report incorrectly said 'long-poll' when data shows no TCP
connections and zero bytes sent — the 318s is pyturso internal
blocking IO (cf. tursodatabase/turso#7349), not waiting for server.

Author: SJYX

data/Test/PullDB.py

@@ -876,10 +876,23 @@ def _net_monitor():
             print(f"  ⚠ TCP 重传率偏高 ({total_retrans} 段)")
             print(f"    建议: 检查网络链路质量")
         elif wait_s > 300:
-            print(f"  ℹ 网络基本正常，瓶颈在 pyturso 内部 long-poll")
-            print(f"    .db 下载: {db_stable_t - db_appeared_t:.1f}s" if db_appeared_t and db_stable_t else "")
+            # 判断瓶颈在服务端还是本地
+            # 如果 connect 返回时无 TCP 连接 + network_sent ≈ 0 → 本地阻塞处理
+            # 如果有活跃 TCP 连接 → 服务端 long-poll
+            has_active_conn = psutil_end.get("connections") if psutil_ok else None
+            sent_bytes = stats_info.get("network_sent_bytes", 0) if stats_info else 0
+
+            if has_active_conn or sent_bytes > 1024:
+                bottleneck = "pyturso 服务端 long-poll（等待服务端确认同步）"
+            else:
+                bottleneck = "pyturso 本地阻塞处理（checkpoint/reconcile/schema 等）"
+
+            print(f"  ℹ 网络基本正常，瓶颈在 {bottleneck}")
+            if db_appeared_t is not None and db_stable_t is not None:
+                print(f"    .db 下载: {db_stable_t - db_appeared_t:.1f}s")
             print(f"    等待 sidecar: {wait_s:.1f}s")
             print(f"    网络中断: {total_outage_s:.1f}s")
+            print(f"    TCP 连接: {'有' if has_active_conn else '无'}  发包: {sent_bytes / 1024:.1f} KB")
             print(f"    建议: 这是 pyturso beta 版本的已知行为")
             print(f"          应用层用后台线程 + readiness gate 包容慢启动")
         else: