Comfy Apps: 12-workflow image-gen web GUI + payment frontend

- Flask frontend + serialized GPU worker + BTCPay invoice/webhook
- 12 example images rendered from the real ComfyUI workflows
- fix: ipadapter workflow uses modern IPAdapter node (was broken IPAdapterApply)
- helper scripts: generate/optimize examples
- README with deploy recipe

.gitignore

@@ -0,0 +1,8 @@
+# runtime data / secrets
+jobs.db
+jobs.db-journal
+results/
+uploads/
+__pycache__/
+*.pyc
+.DS_Store