配置(#24): 放宽发布验收配置校验 (#22)

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

tests/acceptance/README.md

@@ -10,9 +10,11 @@ go test ./tests/acceptance/... -staging-url=https://tapi.hifast.biz
 
 Without credentials, tests that require admin/user login or NodeSecret are skipped and unauthenticated error-path checks still run.
 
-## Required secrets
+## Workflow configuration
 
-The staging workflow should provide these values through GitHub Actions secrets or environment variables:
+`STAGING_BASE_URL` should be provided through GitHub Actions secrets or variables. When omitted, the workflow falls back to `https://tapi.hifast.biz`.
+
+The following secrets are optional. When any of them are missing, the workflow still runs and the corresponding acceptance cases are skipped automatically:
 
 - `ACCEPTANCE_ADMIN_EMAIL`
 - `ACCEPTANCE_ADMIN_PASSWORD`
@@ -24,7 +26,6 @@ The staging workflow should provide these values through GitHub Actions secrets
 - `STAGING_DB_NAME`
 - `STAGING_REDIS_ADDR`
 - `STAGING_REDIS_PASSWORD`
-- `STAGING_BASE_URL`
 
 `ACCEPTANCE_NODE_SECRET` is optional. When DB credentials are present, the loader reads NodeSecret from the staging `system` table instead of storing it as a long-lived secret.