* fix(feishu): parse flat token response from tenant_access_token API
The Feishu /auth/v3/tenant_access_token/internal endpoint returns a flat
JSON response with tenant_access_token and expire at the top level, not
nested under a "data" field. The previous code used FeishuApiResponse<T>
which expects a "data" wrapper, causing all token exchanges to fail with
"Token response missing data" despite receiving a valid HTTP 200 response.
- Replace TenantAccessTokenData with TenantAccessTokenResponse that includes
code/msg/tenant_access_token/expire at the top level
- Deserialize token response directly instead of via FeishuApiResponse<T> wrapper
- Add empty-token guard to catch malformed responses
- No changes to FeishuApiResponse<T> or other API call paths
Fixes#1391
* fix(feishu): address review feedback on token response parsing
- Remove #[serde(default)] from tenant_access_token and expire fields
so deserialization fails explicitly when critical fields are missing
- Add expire > 0 validation guard to prevent refresh loops or overflow
- Use saturating_add/saturating_mul for expiry calculation
- Add 5 regression tests for TenantAccessTokenResponse deserialization
Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
---------
Co-authored-by: reidliu <[email protected]>
Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>
