feat: complete node-agent pipeline, TLS proxy, billing cancel, password reset

Node-agent — full render pipeline (items 1-3):
- render-svc: ClaimedJob now includes aep_download_url (presigned MinIO GET,
  2h TTL, path=templates/{original_project_id}/template.aep)
- render-svc: POST /v1/internal/render/jobs/:id/output-upload-url
  allocates Export row + returns presigned MinIO PUT URL + export_id
- render-svc: db.CreateExportForJob() inserts export row with 30-day retention
- render-svc: InternalHandler now owns minio client (templatesBucket + exportsBucket)
  MINIO_TEMPLATES_BUCKET env var (default flatrender-templates)
- node-agent: runner/download.go — DownloadFile() + UploadFile() (stdlib only)
- node-agent: client.GetOutputUploadURL() + ClaimedJob.AEPDownloadURL field
- node-agent: runJob() full flow: download AEP → render → get upload URL →
  PUT output to MinIO → Complete(export_id)
  All steps are non-fatal with fallback (AEP miss → mock, upload fail → no export)

TLS reverse proxy (item 15):
- Caddyfile: three virtual hosts (DOMAIN, API_DOMAIN, STORAGE_DOMAIN)
  auto-TLS via Let's Encrypt; security headers; 512MB upload limit on API
- docker-compose.v2.yml: caddy:2-alpine service, ports 80/443/443udp,
  caddy_data + caddy_config volumes; env vars DOMAIN/API_DOMAIN/STORAGE_DOMAIN/ACME_EMAIL
- .env.v2.example: new Caddy + MINIO_TEMPLATES_BUCKET entries

Billing portal (item 5):
- Identity: POST /v1/users/me/plan/cancel — sets cancelled_at, auto_renew=false
  (access continues to expiry); 404 when no active plan
- POST /api/billing/cancel — frontend proxy, validates auth
- GET /api/billing/portal — redirects to /dashboard/settings?tab=billing
- SettingsBilling: "Cancel plan" button with confirm dialog + optimistic UI,
  "Change plan" button; becomes "use client" component

Password reset UI (item 7):
- POST /api/auth/password-reset — proxies /v1/auth/password/reset/request
  (always 200, anti-enumeration)
- POST /api/auth/password-reset-confirm — proxies /v1/auth/password/reset/confirm
- AuthPageContent: "Forgot password?" link on sign-in tab opens 2-step reset flow
  (email → OTP+new-password) without leaving the auth page

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.env.v2.example

@@ -56,3 +56,15 @@ TARA_CALLBACK_URL=https://yourdomain.com/v1/payments/callback/tara
 # Get keys from https://dashboard.stripe.com/apikeys
 STRIPE_SECRET_KEY=sk_test_...
 STRIPE_PUBLISHABLE_KEY=pk_test_...
+
+# ── Caddy TLS reverse proxy ───────────────────────────────────────────────────
+# Public-facing domains (Let's Encrypt will provision certs automatically).
+# Leave as localhost for local dev (Caddy uses self-signed cert).
+DOMAIN=flatrender.io
+API_DOMAIN=api.flatrender.io
+STORAGE_DOMAIN=storage.flatrender.io
+ACME_EMAIL=admin@flatrender.io
+
+# ── MinIO templates bucket ────────────────────────────────────────────────────
+# Bucket where .aep template files are stored (uploaded via admin panel).
+MINIO_TEMPLATES_BUCKET=flatrender-templates