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/package.json

@@ -0,0 +1,15 @@
+{
+  "name": "iddaai-image-proxy",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "wrangler dev",
+    "deploy": "wrangler deploy",
+    "typecheck": "tsc --noEmit"
+  },
+  "devDependencies": {
+    "@cloudflare/workers-types": "^4.20260601.0",
+    "typescript": "^5.6.0",
+    "wrangler": "^4.0.0"
+  }
+}