Improve security and deployment flexibility for external access

Update README and application configurations to support reverse proxy setups, including TLS termination and proper cookie handling, and add an option to seed demo meetings.

docker-compose.yml

@@ -32,6 +32,7 @@ services:
       # the first-run Setup Wizard (/api/setup/complete).
       SEED_ADMIN_PASSWORD: ${SEED_ADMIN_PASSWORD:-}
       SEED_USER_PASSWORD: ${SEED_USER_PASSWORD:-}
+      SEED_DEMO_MEETINGS: ${SEED_DEMO_MEETINGS:-false}
       PUBLIC_BASE_URL: ${PUBLIC_BASE_URL:-http://localhost:${APP_PORT:-3000}}
     user: root
     entrypoint: ["/usr/bin/tini", "--"]
@@ -62,6 +63,7 @@ services:
       DEFAULT_OBJECT_STORAGE_BUCKET_ID: ${DEFAULT_OBJECT_STORAGE_BUCKET_ID:-tx-local}
       ALLOWED_ORIGINS: ${ALLOWED_ORIGINS:-http://localhost:${APP_PORT:-3000}}
       PUBLIC_BASE_URL: ${PUBLIC_BASE_URL:-http://localhost:${APP_PORT:-3000}}
+      TRUST_PROXY_HTTPS: ${TRUST_PROXY_HTTPS:-false}
       LOG_LEVEL: ${LOG_LEVEL:-info}
       HTTPS_MODE: ${HTTPS_MODE:-local}
       LOCAL_DOMAIN: ${LOCAL_DOMAIN:-}