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>

docker-compose.v2.yml

@@ -296,6 +296,41 @@ services:
       retries: 3
       start_period: 30s
 
+  # ── Caddy (TLS reverse proxy) ───────────────────────────────────────────────
+  # Handles Let's Encrypt certificates and terminates HTTPS for all three
+  # public domains: frontend, API gateway, and MinIO storage.
+  #
+  # Required .env.v2 vars:  DOMAIN, API_DOMAIN, STORAGE_DOMAIN
+  # Set ACME_EMAIL to a real address so Let's Encrypt can contact you.
+  #
+  # For local dev (no real domain), comment out this block and access
+  # services directly on their host ports (:3000, :8088, :9000).
+  caddy:
+    image: caddy:2-alpine
+    container_name: fr2-caddy
+    restart: unless-stopped
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"   # HTTP/3 QUIC
+    volumes:
+      - ./Caddyfile:/etc/caddy/Caddyfile:ro
+      - caddy_data:/data
+      - caddy_config:/config
+    environment:
+      DOMAIN:         "${DOMAIN:-localhost}"
+      API_DOMAIN:     "${API_DOMAIN:-api.localhost}"
+      STORAGE_DOMAIN: "${STORAGE_DOMAIN:-storage.localhost}"
+      ACME_EMAIL:     "${ACME_EMAIL:-admin@example.com}"
+    depends_on:
+      - frontend
+      - gateway
+      - minio
+    networks:
+      - default
+
 volumes:
   pgdata:
+  caddy_data:
+  caddy_config:
   miniodata: