feat(HEL-402): 接通网站首批只读 datahub 并建立双路对比

默认全部读取/影子开关关闭，网站继续走旧 Tushare 链路；开启单项时只替换该类原料并在失败时回旧，问天保持旧路径。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

tools/build_architecture_inventory.py

@@ -217,6 +217,7 @@ def build() -> dict[str, Any]:
         ),
         "external_data_adapters": [
             {"provider": "tushare", "path": "backend/data/providers/tushare_client.py", "runtime_role": "stable client facade for primary deterministic market data"},
+            {"provider": "datahub", "path": "backend/data/datahub/client.py", "runtime_role": "optional official EOD read path behind per-dataset flags"},
             {"provider": "ifind", "path": "backend/data/providers/ifind_client.py", "runtime_role": "realtime, charts, snapshots, enrichment"},
             {"provider": "eastmoney", "path": "backend/features/market/charts.py", "runtime_role": "display chart fallback"},
             {"provider": "eastmoney", "path": "backend/data/realtime.py", "runtime_role": "isolated realtime observation"},
@@ -235,6 +236,9 @@ def build() -> dict[str, Any]:
         ],
         "provider_construction": [
             {"client": "TushareClient", "owner": "backend/data/providers/tushare.py", "compatibility_fallback": "backend/features/market/service.py"},
+            {"client": "DatahubClient", "owner": "backend/data/gateway.py"},
+            {"client": "DatahubBridge", "owner": "backend/data/gateway.py"},
+            {"client": "DatahubAwareTushareClient", "owner": "backend/data/gateway.py"},
             {"client": "IfindHttpClient", "owner": "backend/data/gateway.py"},
             {"client": "MarketChartClient", "owner": "backend/data/gateway.py"},
             {"client": "WebRealtimeAggregator", "owner": "backend/data/gateway.py"},