Serve images from R2 via files.iddaai.com

Add IMAGE_BASE_URL to the deploy env so the backend builds image URLs
against the Cloudflare image-proxy Worker instead of mackolik, and check
in the Worker source (already live on files.iddaai.com).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

workers/image-proxy/wrangler.toml

@@ -0,0 +1,13 @@
+name = "iddaai-image-proxy"
+main = "src/index.ts"
+compatibility_date = "2026-06-01"
+
+[[r2_buckets]]
+binding = "BUCKET"
+bucket_name = "iddaai-images"
+
+# Custom domain (configured in the Cloudflare dashboard on 2026-06-10;
+# kept here so CLI deploys stay in sync).
+[[routes]]
+pattern = "files.iddaai.com"
+custom_domain = true