Add a feature to generate and apply corner ribbons to images

Introduce a new API endpoint and service for generating triangular ribbon overlays with text using Cloudinary, and integrate this into the image editor.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: ae4037a0-2a6f-4530-9bac-79b543286bda
Replit-Commit-Checkpoint-Type: intermediate_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/397bca8c-984f-43ff-841a-10897aeb8140/ae4037a0-2a6f-4530-9bac-79b543286bda/VEZwUqa

package.json

@@ -50,6 +50,7 @@
     "@types/node-cron": "^3.0.11",
     "@types/pg": "^8.15.5",
     "bcrypt": "^6.0.0",
+    "canvas": "^3.2.0",
     "class-variance-authority": "^0.7.1",
     "cloudinary": "^2.7.0",
     "clsx": "^2.1.1",