fix(infra): whitelist static image assets in traefik

- Added PathRegexp for .svg, .png, .jpg, etc. to public router
- Allows central imgproxy to fetch source images from protected staging environment
- Resolves broken images caused by imgproxy receiving login page HTML

docker-compose.yml

@@ -32,7 +32,7 @@ services:
       - "traefik.http.routers.${PROJECT_NAME:-klz}.middlewares=${AUTH_MIDDLEWARE:-klz-ratelimit,klz-forward,klz-compress}"
 
       # Public Router (Whitelist for OG Images, Sitemaps, Health)
-      - "traefik.http.routers.${PROJECT_NAME:-klz}-public.rule=(${TRAEFIK_HOST_RULE:-Host(`${TRAEFIK_HOST:-klz-cables.com}`)}) && (PathPrefix(`/health`) || PathPrefix(`/sitemap.xml`) || PathPrefix(`/robots.txt`) || PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/_img`) || PathPrefix(`/api/og`) || PathPrefix(`/de/api/og`) || PathPrefix(`/en/api/og`) || PathPrefix(`/opengraph-image`) || PathPrefix(`/de/opengraph-image`) || PathPrefix(`/en/opengraph-image`) || PathPrefix(`/blog/opengraph-image`) || PathPrefix(`/de/blog/opengraph-image`) || PathPrefix(`/en/blog/opengraph-image`) || PathRegexp(`^/sitemap(-[0-9]+)?\\.xml$`))"
+      - "traefik.http.routers.${PROJECT_NAME:-klz}-public.rule=(${TRAEFIK_HOST_RULE:-Host(`${TRAEFIK_HOST:-klz-cables.com}`)}) && (PathPrefix(`/health`) || PathPrefix(`/sitemap.xml`) || PathPrefix(`/robots.txt`) || PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/_img`) || PathPrefix(`/api/og`) || PathPrefix(`/de/api/og`) || PathPrefix(`/en/api/og`) || PathPrefix(`/opengraph-image`) || PathPrefix(`/de/opengraph-image`) || PathPrefix(`/en/opengraph-image`) || PathPrefix(`/blog/opengraph-image`) || PathPrefix(`/de/blog/opengraph-image`) || PathPrefix(`/en/blog/opengraph-image`) || PathRegexp(`^/sitemap(-[0-9]+)?\\.xml$`) || PathRegexp(`^/.*\\.(svg|png|jpg|jpeg|gif|webp|ico)$`))"
       - "traefik.http.routers.${PROJECT_NAME:-klz}-public.entrypoints=${TRAEFIK_ENTRYPOINT:-web}"
       - "traefik.http.routers.${PROJECT_NAME:-klz}-public.tls.certresolver=${TRAEFIK_CERT_RESOLVER:-}"
       - "traefik.http.routers.${PROJECT_NAME:-klz}-public.tls=${TRAEFIK_TLS:-false}"