feat(platform): close AI expense value loop

Add tenant-safe value, telemetry, connector, commercial, and production-readiness foundations.

server/src/app/api/deps.py

@@ -24,7 +24,7 @@ class CurrentUserContext:
     name: str
     role_codes: list[str]
     is_admin: bool
-    tenant_id: str = "default"
+    tenant_id: str
     department_name: str = ""
     department_id: str = ""
     cost_center: str = ""