Employees and admins can pick, drop, swap, and manage coverage through
GET/POST/DELETE /api/shifts. Roster PUT accepts optional email for portal
identity. Slack slash commands and App Home admin modals stay in place.
Co-authored-by: adam <adam@seahavenind.com>
* feat(roster): add Bearer PUT/DELETE roster API
Identity hire needs to write Slack IDs onto roster rows without a stale
daily 3CX sync clearing them, using the existing HTTP client contract.
* fix(roster): strip Secrets Manager token whitespace
A file:// secret commonly includes a trailing newline, so compare_digest
must strip the cached value the same way it strips the Bearer header.
