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>

config/README.md

@@ -12,6 +12,9 @@ These registries describe the approved product surface of the standalone applica
   providers, model entry points, CSS layers, and remaining code hotspots.
 - `data-fields.config.json`: canonical data products, provider eligibility, intended use, and
   known blocked datasets.
+- `datahub.config.json`: optional read-only client for `xiaobai-datahub`. Each dataset has its
+  own `read` / `shadow` flag, all default off. Environment variables `DATAHUB_READ_*` and
+  `DATAHUB_SHADOW_*` can override a single dataset without a master switch.
 - `data-quality.config.json`: freshness, coverage, units, adjustment, point-in-time, and
   fail-closed rules for every canonical data product.
 - `jobs.config.json`: background schedules, dependencies, lock keys, retry policy, timeouts,

config/architecture-inventory.json

@@ -204,6 +204,11 @@
       "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",
@@ -278,6 +283,18 @@
       "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"

config/data-fields.config.json

@@ -2,6 +2,7 @@
   "schema_version": 1,
   "providers": {
     "tushare": {"class": "licensed", "calculation_allowed": true},
+    "datahub": {"class": "licensed", "calculation_allowed": true},
     "ifind": {"class": "licensed", "calculation_allowed": true},
     "eastmoney": {"class": "public_web", "calculation_allowed": false},
     "tencent": {"class": "public_web", "calculation_allowed": false},

config/datahub.config.json

@@ -0,0 +1,18 @@
+{
+  "schema_version": 1,
+  "base_url": "http://127.0.0.1:8766",
+  "timeout_seconds": 8,
+  "retries": 1,
+  "page_limit": 5000,
+  "stale_seconds_max": 86400,
+  "datasets": {
+    "calendar": { "read": false, "shadow": false },
+    "stocks": { "read": false, "shadow": false },
+    "daily": { "read": false, "shadow": false },
+    "index_daily": { "read": false, "shadow": false },
+    "valuation": { "read": false, "shadow": false },
+    "moneyflow": { "read": false, "shadow": false },
+    "auction": { "read": false, "shadow": false },
+    "status": { "read": false, "shadow": false }
+  }
+}