fix(HEL-494): enforce datahub as sole website market boundary

Co-authored-by: multica-agent <github@multica.ai>

backend/application.py

@@ -60,22 +60,6 @@ from backend.llm.service import LLMServiceMixin
 from database import ReviewDatabase
 
 
-LEGACY_SECRET_KEYS = {
-    "TUSHARE_TOKEN",
-    "IFIND_REFRESH_TOKEN",
-    "IFIND_ACCESS_TOKEN",
-    "LLM_API_KEY",
-    "LLM_BASE_URL",
-    "LLM_MODEL",
-    "LLM_PRIMARY_API_KEY",
-    "LLM_PRIMARY_BASE_URL",
-    "LLM_PRIMARY_MODEL",
-    "LLM_FALLBACK_API_KEY",
-    "LLM_FALLBACK_BASE_URL",
-    "LLM_FALLBACK_MODEL",
-}
-
-
 class DashboardService(
     SystemServiceMixin,
     AccountApplicationMixin,
@@ -121,14 +105,9 @@ class DashboardService(
             self._system_credentials,
             MENTOR_SKILLS_DIR,
             PRIVATE_MENTOR_SKILLS_DIR,
-            lambda: self.token,
         )
         self.data_gateway = self.container.data_gateway
         self.ifind = self.container.ifind
-        refresh = str(self._system_credentials.get("ifind_refresh_token") or "")
-        access = str(self._system_credentials.get("ifind_access_token") or "")
-        if refresh or access:
-            self.ifind.set_credentials(refresh, access)
         self.screener = self.container.screener
         self.strategy_tracking = self.container.strategy_tracking
         self.alert_service = self.container.alert_service