init: Prefect ETL sync project (RIIN/SDS → PG) with 12 sync flows

api/_common/__init__.py

@@ -0,0 +1,15 @@
+"""共享基础设施工具:HTTP 基类、TTL 缓存、并发、批量切分。"""
+
+from api._common.batch import chunk, parse_id_text, split_lines
+from api._common.cache import TTLCache
+from api._common.concurrency import run_concurrent
+from api._common.http import TokenHttpClient
+
+__all__ = [
+    "TokenHttpClient",
+    "TTLCache",
+    "run_concurrent",
+    "parse_id_text",
+    "split_lines",
+    "chunk",
+]