The Settings page no longer renders the Resend From Address input or any
of the read-only "Set in config.toml" credential status rows (Apify key,
eBay id/secret, ntfy auth, Resend key). Those rows looked like editable
inputs but were dead text, and duplicated what the Test buttons verify
more authoritatively.
- resend_from is now sourced only from config.toml ([resend] from); it is
removed from settingsKeys, the test-Resend handler, the scheduler email
client, and the schema seed.
- Removed the credStatus templ component, the CredentialStatus field on
SettingsData, and the credentialStatus() handler helper.