Update invoice sending to directly use webhook URL and add timeout

Replaced the backend proxy route for sending invoices with a direct fetch to the webhook URL, incorporating a 60-second timeout using AbortController. Also added 'busboy' and '@types/busboy' to package.json.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 1e4433b5-47ab-464c-b663-fea2e53367dd
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Event-Id: ca0ae43e-5b56-4b02-8cb5-0e76adf608ba
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package.json

@@ -43,12 +43,14 @@
     "@radix-ui/react-tooltip": "^1.2.0",
     "@tanstack/react-query": "^5.60.5",
     "@types/bcrypt": "^6.0.0",
+    "@types/busboy": "^1.5.4",
     "@types/form-data": "^2.2.1",
     "@types/memoizee": "^0.4.12",
     "@types/multer": "^2.0.0",
     "@types/node-fetch": "^2.6.13",
     "@types/pg": "^8.15.4",
     "bcrypt": "^6.0.0",
+    "busboy": "^1.6.0",
     "caniuse-lite": "^1.0.30001727",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",