fix(imgproxy): switch from base64 to plain URL format

Use plain/ source URL format instead of base64 encoding.
Base64 was causing 404 errors from imgproxy.
Plain format verified working via direct curl tests.

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(`${TRAEFIK_HOST:-klz-cables.com}`)}) && (PathPrefix(`/health`) || PathPrefix(`/sitemap.xml`) || PathPrefix(`/robots.txt`) || PathPrefix(`/manifest.webmanifest`) || PathPrefix(`/_img`) || PathPrefix(`/api/og`) || PathPrefix(`/de/api/og`) || PathPrefix(`/en/api/og`) || PathPrefix(`/opengraph-image`) || PathPrefix(`/de/opengraph-image`) || PathPrefix(`/en/opengraph-image`) || PathPrefix(`/blog/opengraph-image`) || PathPrefix(`/de/blog/opengraph-image`) || PathPrefix(`/en/blog/opengraph-image`) || PathRegexp(`^/sitemap(-[0-9]+)?\\.xml$`) || PathRegexp(`^/.*\\.(svg|png|jpg|jpeg|gif|webp|ico)$`))"
+      - "traefik.http.routers.${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(`/logo-white.svg`) || PathPrefix(`/icon-white.svg`) || 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}"
@@ -168,7 +168,6 @@ services:
       IMGPROXY_URL_MAPPING: "${IMGPROXY_URL_MAPPING:-http://klz.localhost/:http://klz-app:3000/,http://cms.klz.localhost/:http://klz-cms:8055/}"
       IMGPROXY_USE_ETAG: "true"
       IMGPROXY_MAX_SRC_RESOLUTION: 20
-      IMGPROXY_ALLOWED_NETWORKS: "10.0.0.0/8,172.16.0.0/12,192.168.0.0/16"
       IMGPROXY_IGNORE_SSL_ERRORS: "true"
       IMGPROXY_DEBUG: "true"
     labels:

lib/imgproxy.ts

@@ -13,22 +13,6 @@ interface ImgproxyOptions {
   extension?: string;
 }
 
-/**
- * Encodes a string to Base64 (URL-safe)
- */
-function encodeBase64(str: string): string {
-  if (typeof Buffer !== 'undefined') {
-    return Buffer.from(str)
-      .toString('base64')
-      .replace(/\+/g, '-')
-      .replace(/\//g, '_')
-      .replace(/=+$/, '');
-  } else {
-    // Fallback for browser environment if Buffer is not available
-    return window.btoa(str).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
-  }
-}
-
 export function getImgproxyUrl(src: string, options: ImgproxyOptions = {}): string {
   // Use local proxy path which is rewritten in next.config.mjs
   const baseUrl = '/_img';
@@ -71,10 +55,10 @@ export function getImgproxyUrl(src: string, options: ImgproxyOptions = {}): stri
     `g:${gravity}`,
   ].join('/');
 
-  // Using /unsafe/ for now as we don't handle signatures yet
+  // Using /unsafe/ with plain/ source URL format
-  // Format: <base_url>/unsafe/<options>/<base64_url>
+  // plain/ format works reliably with imgproxy URL mapping
+  // Format: <base_url>/unsafe/<options>/plain/<source_url>[@<extension>]
   const suffix = extension ? `@${extension}` : '';
-  const encodedSrc = encodeBase64(absoluteSrc + suffix);
 
-  return `${baseUrl}/unsafe/${processingOptions}/${encodedSrc}`;
+  return `${baseUrl}/unsafe/${processingOptions}/plain/${absoluteSrc}${suffix}`;
 }