Add Authentik blueprints for automated OAuth2/OIDC setup

Automate the manual Authentik configuration process using native YAML blueprints
that are applied on container startup.

Changes:
- Add kaboot-setup.yaml blueprint for local development
- Add kaboot-setup-production.yaml.example for production with configurable domains
- Update docker-compose.yml and docker-compose.prod.yml to mount blueprints
- Add AUTHENTIK_BOOTSTRAP_PASSWORD/TOKEN env vars for automated admin setup
- Update setup.sh to generate bootstrap credentials and display admin password
- Update Caddyfile.example with proper proxy headers for Authentik
- Add Caddyfile to .gitignore (user-specific config)
- Update docs with Quick Start sections for automated setup

The blueprints create:
- OAuth2/OIDC provider (public client, client_id: kaboot-spa)
- Kaboot application with redirect URIs
- kaboot-users group with application binding
- Enrollment flow with sign-up capability
- Password complexity policy
- Test user and service account (passwords set manually)

docker-compose.prod.yml

@@ -0,0 +1,111 @@
+services:
+  postgresql:
+    image: docker.io/library/postgres:16-alpine
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -d $${POSTGRES_DB} -U $${POSTGRES_USER}"]
+      start_period: 20s
+      interval: 30s
+      timeout: 5s
+      retries: 5
+    volumes:
+      - postgresql-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_PASSWORD: ${PG_PASS:?database password required}
+      POSTGRES_USER: ${PG_USER:-authentik}
+      POSTGRES_DB: ${PG_DB:-authentik}
+    networks:
+      - kaboot-network
+
+  redis:
+    image: docker.io/library/redis:alpine
+    restart: unless-stopped
+    command: --save 60 1 --loglevel warning
+    healthcheck:
+      test: ["CMD-SHELL", "redis-cli ping | grep PONG"]
+      start_period: 20s
+      interval: 30s
+      timeout: 3s
+      retries: 5
+    volumes:
+      - redis-data:/data
+    networks:
+      - kaboot-network
+
+  authentik-server:
+    image: ghcr.io/goauthentik/server:2025.2
+    restart: unless-stopped
+    command: server
+    environment:
+      AUTHENTIK_REDIS__HOST: redis
+      AUTHENTIK_POSTGRESQL__HOST: postgresql
+      AUTHENTIK_POSTGRESQL__USER: ${PG_USER:-authentik}
+      AUTHENTIK_POSTGRESQL__NAME: ${PG_DB:-authentik}
+      AUTHENTIK_POSTGRESQL__PASSWORD: ${PG_PASS}
+      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY}
+      AUTHENTIK_BOOTSTRAP_PASSWORD: ${AUTHENTIK_BOOTSTRAP_PASSWORD:-}
+      AUTHENTIK_BOOTSTRAP_TOKEN: ${AUTHENTIK_BOOTSTRAP_TOKEN:-}
+    volumes:
+      - ./authentik/media:/media
+      - ./authentik/custom-templates:/templates
+      - ./authentik/blueprints:/blueprints/custom
+    depends_on:
+      postgresql:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - kaboot-network
+
+  authentik-worker:
+    image: ghcr.io/goauthentik/server:2025.2
+    restart: unless-stopped
+    command: worker
+    environment:
+      AUTHENTIK_REDIS__HOST: redis
+      AUTHENTIK_POSTGRESQL__HOST: postgresql
+      AUTHENTIK_POSTGRESQL__USER: ${PG_USER:-authentik}
+      AUTHENTIK_POSTGRESQL__NAME: ${PG_DB:-authentik}
+      AUTHENTIK_POSTGRESQL__PASSWORD: ${PG_PASS}
+      AUTHENTIK_SECRET_KEY: ${AUTHENTIK_SECRET_KEY}
+    user: root
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - ./authentik/media:/media
+      - ./authentik/certs:/certs
+      - ./authentik/custom-templates:/templates
+    depends_on:
+      postgresql:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    networks:
+      - kaboot-network
+
+  kaboot-backend:
+    build:
+      context: ./server
+      dockerfile: Dockerfile
+    restart: unless-stopped
+    environment:
+      NODE_ENV: production
+      PORT: 3001
+      DATABASE_PATH: /data/kaboot.db
+      OIDC_ISSUER: ${OIDC_ISSUER}
+      OIDC_JWKS_URI: ${OIDC_JWKS_URI}
+      OIDC_INTERNAL_JWKS_URI: http://authentik-server:9000/application/o/kaboot/jwks/
+      CORS_ORIGIN: ${CORS_ORIGIN}
+      LOG_REQUESTS: ${LOG_REQUESTS:-true}
+    volumes:
+      - kaboot-data:/data
+    networks:
+      - kaboot-network
+
+volumes:
+  postgresql-data:
+  redis-data:
+  kaboot-data:
+
+networks:
+  kaboot-network:
+    driver: bridge