Return a dictionary of public settings for the frontend to consume.
Response
A dictionary of public configuration settings.
Version of the application
Maximum size in bytes for outgoing email attachments
Maximum number of recipients per message (to + cc + bcc)
Maximum size in bytes for images embedded in templates and signatures
Whether external images should be proxied
Hostnames whose external links skip the redirect confirmation modal (a leading *. wildcard also matches subdomains)
Maximum age in seconds for a message to be eligible for manual retry of failed deliveries
Whether silent OIDC login is enabled
Sentry DSN shared with the frontend
Theme configuration for the frontend (theme, terms_of_service_url, footer)
Whether the frontend should fall back to LANGUAGE_CODE instead of the browser language
Chunk size in MB for frontend multipart uploads
Help center URL
OTA channel manifest URL the mobile apps poll at startup; unset disables OTA updates
Whether push notifications are available on this deployment (gates the device-registration UI).
VAPID public key (base64url) the web client passes as applicationServerKey to subscribe; null when Web Push is not configured.