fix(infra): whitelist /_img proxy path and restore image config

- Whitelisted /_img path in Traefik labels to allow public access (fixing login page images)
- Restored dangerouslyAllowSVG and CSP settings in next.config.mjs (lost in shallow merge)
- Ensuring Next.js proxy works correctly behind Gatekeeper

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(`${TRAEFIK_HOST:-klz-cables.com}`)}) && (PathPrefix(`/health`) || PathPrefix(`/sitemap.xml`) || PathPrefix(`/robots.txt`) || PathPrefix(`/manifest.webmanifest`) || PathRegexp(`^/([a-z]{2}/)?api/og`) || PathRegexp(`^/([a-z]{2}/)?opengraph-image$`) || PathRegexp(`^/([a-z]{2}/)?blog/opengraph-image$`) || PathRegexp(`^/sitemap(-[0-9]+)?\\.xml$`))"
+      - "traefik.http.routers.${PROJECT_NAME:-klz}-public.rule=(${TRAEFIK_HOST:-Host(`${TRAEFIK_HOST:-klz-cables.com}`)}) && (PathPrefix(`/health`) || PathPrefix(`/sitemap.xml`) || PathPrefix(`/robots.txt`) || PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/_img`) || PathRegexp(`^/([a-z]{2}/)?api/og`) || PathRegexp(`^/([a-z]{2}/)?opengraph-image$`) || PathRegexp(`^/([a-z]{2}/)?blog/opengraph-image$`) || PathRegexp(`^/sitemap(-[0-9]+)?\\.xml$`))"
       - "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}"

next.config.mjs

@@ -319,6 +319,9 @@ const nextConfig = {
   images: {
     loader: 'custom',
     loaderFile: './lib/imgproxy-loader.ts',
+    dangerouslyAllowSVG: true,
+    contentDispositionType: "attachment",
+    contentSecurityPolicy: "default-src 'self'; script-src 'none'; sandbox;",
   },
   async rewrites() {
     const umamiUrl =