fix(treasury): apply a full receipt or payment to the party's open balance

A settled document of the same amount no longer leaves an existing remaining unchanged.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/treasury/treasury.controller.ts

@@ -129,6 +129,29 @@ export class TreasuryController {
     return this.treasury.partyBalances(user, kind === 'expense' ? 'expense' : 'income');
   }
 
+  @Post('party-balances/collect')
+  collectPartyBalance(
+    @CurrentUser() user: Actor,
+    @Body()
+    body: {
+      kind?: string;
+      partyKind?: 'person' | 'company' | 'user';
+      partyId?: string;
+      amount?: string | number;
+      accountId?: string;
+      occurredAt?: string;
+    },
+  ) {
+    return this.treasury.collectPartyBalance(user, {
+      kind: body.kind === 'expense' ? 'expense' : 'income',
+      partyKind: body.partyKind ?? 'person',
+      partyId: body.partyId ?? '',
+      amount: body.amount ?? 0,
+      accountId: body.accountId ?? '',
+      occurredAt: body.occurredAt,
+    });
+  }
+
   @Get('documents')
   documents(
     @CurrentUser() user: Actor,