feat: add Copayment and Adjustment columns to payments table

- Added copayment and adjustment fields (Decimal, default 0) to Payment
  model in schema and directly to DB via ALTER TABLE
- Added PATCH /api/payments/:id/copayment and /adjustment routes
- Added inline-editable Copayment and Adjustment columns after MH Paid
  with same click-to-edit format; Copayment in blue, Adjustment in orange

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/db/generated/prisma/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "prisma-client-0bdd2a07b3e749bc95e70fecd3048246327d26e93efa4b1a746b1800ef21ae70",
+  "name": "prisma-client-ebe3d1cd873b9c6e2edb160c4f217518634cbc7f123503e3d10ebc0103f5ee7e",
   "main": "index.js",
   "types": "index.d.ts",
   "browser": "default.js",