Refactor backend and add registry build workflow

.env.example

@@ -0,0 +1,46 @@
+# Flask
+PORT=8080
+WS_PORT=8081
+# Configure a random secret with at least 32 characters for persistent sessions.
+JWT_SECRET=
+ENABLE_SAMPLE_DATA=false
+# Set SAMPLE_USER_PASSWORD only for isolated development fixtures.
+SAMPLE_USER_PASSWORD=
+
+# Database (SQLite for local dev, PostgreSQL in production)
+DATABASE_URL=sqlite:///anchorhost.db
+
+# Kubernetes (in-cluster when deployed; kubeconfig locally)
+# KUBECONFIG=/path/to/kubeconfig
+
+# Stripe
+STRIPE_SECRET_KEY=
+STRIPE_WEBHOOK_SECRET=
+
+# OAuth
+GOOGLE_CLIENT_ID=
+GOOGLE_CLIENT_SECRET=
+GOOGLE_REDIRECT_URI=http://localhost:8080/api/auth/google/callback
+APPLE_CLIENT_ID=
+APPLE_TEAM_ID=
+APPLE_KEY_ID=
+APPLE_PRIVATE_KEY=
+
+# DNS / domains (deSEC)
+DESEC_API_TOKEN=
+BASE_DOMAIN=anchorhost.eu
+NODE_IP=127.0.0.1
+
+# Email (SMTP)
+SMTP_HOST=
+SMTP_PORT=587
+SMTP_USER=
+SMTP_PASSWORD=
+SMTP_FROM=
+SMTP_FROM_NAME=AnchorHost
+SMTP_USE_TLS=true
+BASE_URL=http://localhost:8080
+FRONTEND_URL=http://localhost:3000
+
+# Game servers
+MINECRAFT_RCON_PASSWORD=change-me-in-production