feat: self-service sign-up with email verification and onboarding

Complete sign-up pipeline: email registration via Logto Experience API,
SMTP email verification, and self-service trial tenant creation.

Layer 1 — Logto config:
- Bootstrap Phase 8b: SMTP email connector with branded HTML templates
- Bootstrap Phase 8c: enable SignInAndRegister (email+password sign-up)
- Dockerfile installs official Logto connectors (ensures SMTP available)
- SMTP env vars in docker-compose, installer templates, .env.example

Layer 2 — Experience API (ui/sign-in/experience-api.ts):
- Registration flow: initRegistration → sendVerificationCode → verifyCode
  → addProfile (password) → identifyUser → submit
- Sign-in auto-detects email vs username identifier

Layer 3 — Custom sign-in UI (ui/sign-in/SignInPage.tsx):
- Three-mode state machine: signIn / register / verifyCode
- Reads first_screen=register from URL query params
- Toggle links between sign-in and register views

Layer 4 — Post-registration onboarding:
- OnboardingService: reuses VendorTenantService.createAndProvision(),
  adds calling user to Logto org as owner, enforces one trial per user
- OnboardingController: POST /api/onboarding/tenant (authenticated only)
- OnboardingPage.tsx: org name + auto-slug form
- LandingRedirect: detects zero orgs → redirects to /onboarding
- RegisterPage.tsx: /platform/register initiates OIDC with firstScreen

Installers (install.sh + install.ps1):
- Both prompt for SMTP config in SaaS mode
- CLI args, env var capture, cameleer.conf persistence

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/CLAUDE.md

@@ -42,11 +42,13 @@ Server containers join three networks: tenant network (primary), shared services
 
 ## Custom sign-in UI (`ui/sign-in/`)
 
-Separate Vite+React SPA replacing Logto's default sign-in page. Visually matches cameleer-server LoginPage.
+Separate Vite+React SPA replacing Logto's default sign-in page. Supports both sign-in and self-service registration.
 
-- Built as custom Logto Docker image (`cameleer-logto`): `ui/sign-in/Dockerfile` = node build stage + `FROM ghcr.io/logto-io/logto:latest` + COPY dist over `/etc/logto/packages/experience/dist/`
+- Built as custom Logto Docker image (`cameleer-logto`): `ui/sign-in/Dockerfile` = node build stage + `FROM ghcr.io/logto-io/logto:latest` + install official connectors (SMTP) + COPY dist over `/etc/logto/packages/experience/dist/`
 - Uses `@cameleer/design-system` components (Card, Input, Button, FormField, Alert)
-- Authenticates via Logto Experience API (4-step: init -> verify password -> identify -> submit -> redirect)
+- **Sign-in**: Logto Experience API (4-step: init -> verify password -> identify -> submit -> redirect). Auto-detects email vs username identifier.
+- **Registration**: 2-phase flow. Phase 1: init Register -> send verification code to email. Phase 2: verify code -> set password -> identify (creates user) -> submit -> redirect.
+- Reads `first_screen=register` from URL query params to show register form initially (set by `@logto/react` SDK's `firstScreen` option)
 - `CUSTOM_UI_PATH` env var does NOT work for Logto OSS — must volume-mount or replace the experience dist directory
 - Favicon bundled in `ui/sign-in/public/favicon.svg` (served by Logto, not SaaS)
 
@@ -81,8 +83,12 @@ Idempotent script run inside the Logto container entrypoint. **Clean slate** —
 5. Create admin user (SaaS admin with Logto console access)
 7b. Configure Logto Custom JWT for access tokens (maps org roles -> `roles` claim: owner->server:admin, operator->server:operator, viewer->server:viewer; saas-vendor global role -> server:admin)
 8. Configure Logto sign-in branding (Cameleer colors `#C6820E`/`#D4941E`, logo from `/platform/logo.svg`)
+8b. Configure SMTP email connector (if `SMTP_HOST`/`SMTP_USER` env vars set) — discovers factory via `/api/connector-factories`, creates connector with Cameleer-branded HTML email templates for Register/SignIn/ForgotPassword/Generic. Skips gracefully if SMTP not configured.
+8c. Enable self-service registration — sets `signInMode: "SignInAndRegister"`, `signUp: { identifiers: ["email"], password: true, verify: true }`, sign-in methods: email+password and username+password (backwards-compatible with admin user).
 9. Cleanup seeded Logto apps
 10. Write bootstrap results to `/data/logto-bootstrap.json`
 12. Create `saas-vendor` global role with all API scopes and assign to admin user (always runs — admin IS the platform admin).
 
+SMTP env vars for email verification: `SMTP_HOST`, `SMTP_PORT` (default 587), `SMTP_USER`, `SMTP_PASS`, `SMTP_FROM_EMAIL` (default `noreply@cameleer.io`). Passed to `cameleer-logto` container via docker-compose. Both installers prompt for these in SaaS mode.
+
 The multi-tenant compose stack is: Traefik + PostgreSQL + ClickHouse + Logto (with bootstrap entrypoint) + cameleer-saas. No `cameleer-server` or `cameleer-server-ui` in compose — those are provisioned per-tenant by `DockerTenantProvisioner`.