feat(frontend): enhance API credentials system and build configuration

Add real API support in demo mode with credential checking, implement build-time version injection from package.json, and refactor update checking with 24-hour caching. Migrate landing page from Vue to Astro with comprehensive UI components including Hero, Features, Benefits, and Tech Stack sections. Update CI/CD workflow with expanded cache paths and security scanner version pinned.

landing/docker-compose.yml

@@ -0,0 +1,50 @@
+services:
+  trackeep-landing:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    ports:
+      - "8080:80"
+    environment:
+      - NODE_ENV=production
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+      start_period: 40s
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.trackeep-landing.rule=Host(`trackeep.org`, `www.trackeep.org`)"
+      - "traefik.http.routers.trackeep-landing.entrypoints=websecure"
+      - "traefik.http.routers.trackeep-landing.tls.certresolver=letsencrypt"
+      - "traefik.http.services.trackeep-landing.loadbalancer.server.port=80"
+
+  # Optional: Add reverse proxy with Traefik for SSL termination
+  traefik:
+    image: traefik:v2.10
+    command:
+      - "--api.dashboard=true"
+      - "--providers.docker=true"
+      - "--providers.docker.exposedbydefault=false"
+      - "--entrypoints.web.address=:80"
+      - "--entrypoints.websecure.address=:443"
+      - "--certificatesresolvers.letsencrypt.acme.httpchallenge=true"
+      - "--certificatesresolvers.letsencrypt.acme.httpchallenge.entrypoint=web"
+      - "--certificatesresolvers.letsencrypt.acme.email=admin@trackeep.org"
+      - "--certificatesresolvers.letsencrypt.acme.storage=/letsencrypt/acme.json"
+    ports:
+      - "80:80"
+      - "443:443"
+      - "8081:8080"  # Traefik dashboard
+    volumes:
+      - "/var/run/docker.sock:/var/run/docker.sock:ro"
+      - "./letsencrypt:/letsencrypt"
+    restart: unless-stopped
+    profiles:
+      - ssl
+
+networks:
+  default:
+    name: trackeep-landing-network