Terms of service and privacy policy with signup consent enforcement

Features

• Terms of service and privacy policy with signup consent enforcement
• Mailbox and outbound routes now proxied through the main API
• Storage usage endpoint, admin quotas, and attachment metadata in the portal

Fixes

• Fixed mailbox ID forwarding through agent send endpoints
• Fixed approval queue counts scoped to the current mailbox
• Fixed tenant resolution for custom domain inbound routing
• Fixed catch-all routing blocked on the shared domain
• Fixed domain receiving enabled on add and synced on verify
• Fixed admin dashboard compatibility with Edge runtime
• Fixed cooldown bypass for thread replies with auto-linking