feat(team-admin): t-paliad-223 Slice B — Add User via Supabase Admin API
#49 — adds a third "Konto direkt anlegen" path on /admin/team alongside
"Onboard existing" and "Invite colleague". Creates both auth.users (via
Supabase Admin API) and paliad.users in one click; new user is visible in
dropdowns immediately and receives a paliad-branded magic-link email.
- internal/services/supabase_admin.go: new SupabaseAdminClient — thin net/http shim. 3 methods (CreateAuthUser, GenerateRecoveryLink, DeleteAuthUser). 10s timeout. ErrSupabaseAdminUnavailable when key unset, ErrSupabaseEmailExists when 422-with-"already" returned. apikey + Bearer headers on every call. Sentinel errors for handler mapping.
- internal/services/supabase_admin_test.go: 5 tests pin wire-shape (disabled mode, happy-path POST + headers + body, email-exists mapping, both action-link response shapes, DELETE-by-id route).
- internal/services/user_service.go: UserService grows optional supabase + mail + baseURL dependencies via SetAddUserDeps. AdminCreateFullInput (email/display_name/office/job_title/profession/lang/send_welcome_mail + inviter fields). AdminCreateUserFull validates input → calls supabase.CreateAuthUser → inserts paliad.users (best-effort DeleteAuthUser rollback on insert fail) → writes paliad.system_audit_log row (event_type='user.added_by_admin') → sends welcome mail with magic-link (best-effort).
- internal/templates/email/add_user_welcome.{de,en}.html: new template with magic-link CTA + base-URL fallback + firm-name placeholder. Editable through the existing /admin/email-templates editor (admin-overridable via DB).
- internal/services/email_template_*.go: register 'add_user_welcome' as a fourth canonical key, defaultSubjects entry, sample data, variable contract (6 vars).
- internal/services/mail_service_test.go: TestRenderTemplateAddUserWelcome pins both langs render with magic-link + firm + matching subject.
- internal/handlers/admin_users.go: handleAdminCreateFullUser POST /api/admin/users/full. Fills inviter fields from auth.uid() server-side (never trusts the request body). Error map: 503 (unavailable), 409 (email exists / already onboarded), 400 (invalid input), 403 (domain not on whitelist), 500 (other).
- internal/handlers/handlers.go: route registered behind adminGate.
- cmd/server/main.go: LoadSupabaseAdminClient + users.SetAddUserDeps + boot-log line so the deployer knows whether the path is active.
- frontend/src/admin-team.tsx: "Konto direkt anlegen" button + admin-add-full-modal with email/name/office/profession/job_title/lang fields + send-welcome checkbox (default on).
- frontend/src/client/admin-team.ts: initAddFullModal — POST to /api/admin/users/full, inline error handling for 503 / 409 / generic, optimistic insert into users[] on success, name auto-fills from email local-part on blur.
- i18n: +20 keys (admin.team.add.full + admin.team.add_full.*) × DE + EN.
Design picks honoured: Supabase Admin API path (Q1), welcome email default on (Q2), two-step with best-effort rollback (Q3), job_title default 'Associate' (Q4), profession default 'associate' (Q5). Trade-off #3 from §6 (privileged credential broadens trust surface) accepted by m via head.
go build && go test -short ./internal/... + bun run build all green.
mAi
3d3a4fa36d