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/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "lib": ["ES2022"],
+    "module": "ES2022",
+    "moduleResolution": "Bundler",
+    "strict": true,
+    "noEmit": true,
+    "types": ["@cloudflare/workers-types"]
+  },
+  "include": ["src"]
+}