feat(auth): trusted devices, recovery codes, and admin MFA management
Add opt-in "Trust this device" so a browser/app skips the TOTP step (never the password) for 30 days, single-use bcrypt recovery codes as a 2FA-lockout fallback, and admin trusted-device/MFA-reset management — backend, web UI, OpenAPI spec, and tests. - Schema: trusted_devices (sha256 token hash, looked up by unique index) and recovery_codes (bcrypt, single-use). Both additive/idempotent. - Session service: trust-token mint/hash/resolve + cap helpers; new rg_trust httpOnly cookie (survives logout, revoked on untrust/password change/reset/ TOTP disable). JWTs stay stateless — trust is a server-side row, not a claim. - Web + mobile login accept a trusted-device token / recovery code; login/totp gains trustDevice + recoveryCode. Cap of 10/user with NO silent pruning — an over-cap trust returns 409/trustLimitReached and the client prompts to revoke. - Self-service /auth/me/trusted-devices* + recovery-codes*; admin /admin/users/:id/trusted-devices* + /mfa/reset. All actions audit-logged. - Client: "Trust this device" + recovery-code login options, one-time recovery code display, Trusted Devices + Recovery Codes account panels, a TOTP-styled revoke-to-continue cap modal, and admin per-user security controls. - OpenAPI regenerated; 33 new server tests (all suites green). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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