feat: ship Tier 1 — auth, authz, rate limits, real notifications, CSV import, billing, backups/DR, privacy

Closes every block in docs/TIER1_PLAN.md from the Claude-scope side. The
homelab / cloud setup steps (SES verification, restore drill, lawyer-
drafted ToS) remain operator-owned but are unblocked.

Block A — Authentication
- Migration 0003: password_hash, email_verified, email_verification_tokens,
  password_reset_tokens, refresh_tokens (with replaced_by family chain).
- Bcrypt hasher, HS256 JWT signer, single-use refresh tokens with rotation
  + replay-detection (revokes the family on reuse).
- /auth/signup, /login, /refresh, /logout, /verify-email,
  /forgot-password, /reset-password — enumeration-safe.
- requireAuth middleware + GET /me.
- Frontend useAuth/useApi with auto-refresh-on-401, login/signup/verify/
  forgot/reset pages, route-guard middleware.

Block B — Authorisation
- EventRepo.GetForHost; Update/Delete scoped by host_id.
- All host routes behind requireAuth + ownership; cross-tenant returns
  404 (no enumeration). ?host_id removed.
- WS auth via short-lived single-use tickets (POST /auth/ws-ticket).
- Tests: TestCrossTenantIsolation — 9 probes.

Block C — Rate limiting
- Redis sliding-window via Lua (atomic ZADD+ZCARD+PEXPIRE).
- Per-route limits matching the plan (signup IP, login IP+email, RSVP/
  access by token, events/guests/tokens by user_id).
- 429 with Retry-After header and JSON body.
- Auth lockout: 5 failed logins → account locked, only password reset
  clears it.
- Frontend: useErrMessage normalises 429 + locked messaging.

Block D — Real notifications
- Migration 0004: provider_message_id, bounce_type, complained columns
  + unsubscribes (CITEXT) suppression table.
- Branded HTML + plaintext templates for verification, reset, invitation,
  confirmation, reminder. Per-page templates avoid html/template's
  contextual-escape collisions.
- Senders: SESv2, Twilio (SMS), SMTP (Mailpit-friendly), Resend HTTP.
- PickEmailSender priority Resend > SMTP > SES > Log — system boots
  cleanly in dev with Mailpit; production flips one env var.
- Webhook endpoints (Twilio status + SES SNS) — bounces add to suppression;
  signature verification stubbed pending creds.
- Auto-send: POST /tokens publishes invitation.send; notifier renders +
  delivers via the configured backend; suppression list honoured.
- Bulk + per-row invitation flow: POST /events/{id}/guests/invitations/bulk
  returns per-guest tokens so phone-only guests can be SMS'd manually.
- Unsubscribe: signed HMAC token (no TTL) + /unsubscribe/[token] page.
- WhatsApp Option A+: wa.me click-to-chat wizard with per-guest progress
  tracking, isLikelyE164 validation, edit-from-wizard.
- Token rotate (POST /tokens/rotate) invalidates the old URL — used by
  the regenerate-link flow.
- Mailpit added to docker-compose for dev inbox.

Block E — CSV import
- Streaming parser: tolerant header detection, UTF-8 BOM + UTF-16 LE/BE
  decoding, row-level validation, 5,000-row cap.
- Strict E.164 phone validation with helpful error message.
- POST /preview + /import + GET /template; preview UI on event page;
  atomic per-batch with dedup on existing emails.

Phone capture across UI
- PhoneInput component: country picker (~50 ISO codes) + national input +
  live E.164 preview + inline length validation.
- Used in Add Guest and Edit Guest modals. Smart paste-handling extracts
  country code from full E.164 strings.

Block F — Billing (Stripe)
- Migration 0005: subscriptions table (user_id → tier/status/period_end +
  Stripe customer/sub ids). Partial unique index keeps one granting sub
  per user.
- internal/billing: Tier + Limits model (Free 1/50, Pro 10/1000, Business
  ∞/5000), Stripe SDK wrapper with IgnoreAPIVersionMismatch for newer
  account API versions.
- /billing/checkout-session, /billing/portal, /billing/status,
  /webhooks/stripe (signature-verified, lifecycle events).
- Tier enforcement: 402 on POST /events, /guests, /import with
  {error, reason, tier, used, limit, upgrade_url} body.
- Frontend: useBilling composable, /dashboard/billing page (current plan,
  usage bars, tier cards), global UpgradeModal triggered by useApi's
  402 interceptor.
- Customer portal kept for self-service cancel/payment-method changes.

Block G — Backups & DR (application side)
- Every migration has a tested .down.sql.
- TestMigrationRoundtrip applies all ups → all downs → all ups against a
  fresh container; catches asymmetric down migrations.
- cmd/restore-verify: 28-check post-restore invariant tool (schema
  presence, no orphans across 10 FK relationships, email uniqueness,
  single-active subscription, row-count snapshot).
- docs/RUNBOOK_RESTORE.md: 9-step restore procedure with RTO/RPO
  targets, drill instructions, rollback path.

Block H — Privacy compliance (application side)
- Migration 0006: deleted_at + terms_accepted_at + privacy_policy_accepted_at
  on users. Partial index on email for live-only uniqueness.
- GET /me/data-export — synchronous JSON dump (user, events, guests,
  tokens, rsvps, access_logs, notifications).
- DELETE /me — soft-delete with PII scrub + refresh-token revocation;
  re-signup with same email works.
- POST /me/accept-terms — idempotent consent recording.
- Frontend /privacy + /terms placeholder pages with substantive (pending
  legal review) copy; footer links; signup terms checkbox; TermsGateModal
  for accounts created before the rollout; export + delete buttons on
  /dashboard/billing.

Tests
- All migrations verified up/down/up.
- Integration suite: TestE2EHappyPath, TestAuthFlow, TestCrossTenantIsolation,
  TestRateLimitSignup, TestLoginLockout, TestUnsubscribeFlow,
  TestSESBounceWebhook, TestTwilioStatusWebhook, TestCsvImportFlow,
  TestCsvImportAtomicRollback, TestBulkIssueInvitations, TestBulkIssueExplicitSubset,
  TestTokenIssuePublishesInvitation, TestTokenIssueWithoutGuestEmailSkipsInvitation,
  TestGuestUpdate, TestGuestDelete, TestTokenRotate, TestSMTPSenderAgainstMailpit,
  TestFreeTierEventLimit, TestFreeTierGuestLimit, TestBusinessTierBypassesLimits,
  TestDataExport, TestDeleteMe, TestAcceptTerms, TestMigrationRoundtrip.
  Full suite runs in ~120s against real Postgres + NATS + Redis + Mailpit.
- Unit suite green across internal/auth, internal/csvimport,
  internal/notification, internal/ratelimit, internal/domain.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

internal/notification/email_ses.go

@@ -0,0 +1,137 @@
+package notification
+
+import (
+	"context"
+	"fmt"
+	"strings"
+
+	"github.com/aws/aws-sdk-go-v2/aws"
+	awsconfig "github.com/aws/aws-sdk-go-v2/config"
+	"github.com/aws/aws-sdk-go-v2/service/sesv2"
+	"github.com/aws/aws-sdk-go-v2/service/sesv2/types"
+)
+
+// SESConfig is the surface area for picking an SES sender. ConfigurationSet
+// is optional but recommended in production — it's where bounce + complaint
+// SNS topics get wired so the webhook handler has something to consume.
+type SESConfig struct {
+	Region           string
+	FromEmail        string
+	FromName         string
+	ConfigurationSet string
+	PublicBaseURL    string // for unsubscribe links in templates
+}
+
+// SESEmailSender sends transactional emails (verification + reset for the
+// auth flows, plus invitation/confirmation/reminder for guests) via Amazon
+// SESv2. The same client serves both audiences so callers don't end up
+// with two SES configurations to maintain.
+type SESEmailSender struct {
+	client    *sesv2.Client
+	tpls      *Templates
+	from      string
+	configSet *string
+	baseURL   string
+}
+
+// NewSESEmailSender returns a configured SES sender, or an error if the
+// AWS SDK can't bootstrap. The caller typically constructs this once at
+// startup and reuses it for the lifetime of the process.
+func NewSESEmailSender(ctx context.Context, cfg SESConfig, tpls *Templates) (*SESEmailSender, error) {
+	if cfg.FromEmail == "" {
+		return nil, fmt.Errorf("ses: FromEmail required")
+	}
+	if cfg.Region == "" {
+		cfg.Region = "us-east-1"
+	}
+
+	awsCfg, err := awsconfig.LoadDefaultConfig(ctx, awsconfig.WithRegion(cfg.Region))
+	if err != nil {
+		return nil, fmt.Errorf("ses: load aws config: %w", err)
+	}
+	client := sesv2.NewFromConfig(awsCfg)
+
+	from := cfg.FromEmail
+	if cfg.FromName != "" {
+		from = fmt.Sprintf("%s <%s>", cfg.FromName, cfg.FromEmail)
+	}
+	var cs *string
+	if cfg.ConfigurationSet != "" {
+		cs = aws.String(cfg.ConfigurationSet)
+	}
+
+	return &SESEmailSender{
+		client:    client,
+		tpls:      tpls,
+		from:      from,
+		configSet: cs,
+		baseURL:   strings.TrimRight(cfg.PublicBaseURL, "/"),
+	}, nil
+}
+
+// --- auth.EmailSender implementation ---
+
+// SendVerification renders the verification template and posts it to SES.
+func (s *SESEmailSender) SendVerification(ctx context.Context, to, name, link string) error {
+	return s.sendTemplated(ctx, to, "Verify your GuestGuard email",
+		TmplVerification, map[string]any{
+			"Name": name,
+			"Link": link,
+		})
+}
+
+// SendPasswordReset renders the reset template and posts it to SES.
+func (s *SESEmailSender) SendPasswordReset(ctx context.Context, to, name, link string) error {
+	return s.sendTemplated(ctx, to, "Reset your GuestGuard password",
+		TmplPasswordReset, map[string]any{
+			"Name":         name,
+			"Link":         link,
+			"ExpiryHumane": "1 hour",
+		})
+}
+
+// SendGuest is used by the notifier worker for invitation / confirmation /
+// reminder emails — anything addressed at a guest.
+func (s *SESEmailSender) SendGuest(ctx context.Context, to, subject string, name TemplateName, data map[string]any) (providerMessageID string, err error) {
+	return s.sendTemplatedReturnID(ctx, to, subject, name, data)
+}
+
+// --- internals ---
+
+func (s *SESEmailSender) sendTemplated(ctx context.Context, to, subject string, name TemplateName, data map[string]any) error {
+	_, err := s.sendTemplatedReturnID(ctx, to, subject, name, data)
+	return err
+}
+
+func (s *SESEmailSender) sendTemplatedReturnID(ctx context.Context, to, subject string, name TemplateName, data map[string]any) (string, error) {
+	if data == nil {
+		data = map[string]any{}
+	}
+	data["Subject"] = subject
+	html, text, err := s.tpls.Render(name, data)
+	if err != nil {
+		return "", err
+	}
+
+	out, err := s.client.SendEmail(ctx, &sesv2.SendEmailInput{
+		FromEmailAddress:     aws.String(s.from),
+		Destination:          &types.Destination{ToAddresses: []string{to}},
+		ConfigurationSetName: s.configSet,
+		Content: &types.EmailContent{
+			Simple: &types.Message{
+				Subject: &types.Content{Data: aws.String(subject), Charset: aws.String("UTF-8")},
+				Body: &types.Body{
+					Html: &types.Content{Data: aws.String(html), Charset: aws.String("UTF-8")},
+					Text: &types.Content{Data: aws.String(text), Charset: aws.String("UTF-8")},
+				},
+			},
+		},
+	})
+	if err != nil {
+		return "", fmt.Errorf("ses: send: %w", err)
+	}
+	if out.MessageId == nil {
+		return "", nil
+	}
+	return *out.MessageId, nil
+}