fix: resolve 5 invoice/payment issues from user feedback

- Replace misleading 'sent' status with 'pending' (no email capability)
- Show assessment group name instead of raw 'regular_assessment' type
- Add owner last name to invoice table
- Fix payment creation Internal Server Error (PostgreSQL $2 type cast)
- Add edit/delete capability for payment records with invoice recalc

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

backend/src/modules/payments/payments.controller.ts

@@ -1,4 +1,4 @@
-import { Controller, Get, Post, Body, Param, UseGuards, Request } from '@nestjs/common';
+import { Controller, Get, Post, Put, Delete, Body, Param, UseGuards, Request } from '@nestjs/common';
 import { ApiTags, ApiBearerAuth } from '@nestjs/swagger';
 import { JwtAuthGuard } from '../auth/guards/jwt-auth.guard';
 import { PaymentsService } from './payments.service';
@@ -18,4 +18,12 @@ export class PaymentsController {
 
   @Post()
   create(@Body() dto: any, @Request() req: any) { return this.paymentsService.create(dto, req.user.sub); }
+
+  @Put(':id')
+  update(@Param('id') id: string, @Body() dto: any, @Request() req: any) {
+    return this.paymentsService.update(id, dto, req.user.sub);
+  }
+
+  @Delete(':id')
+  delete(@Param('id') id: string) { return this.paymentsService.delete(id); }
 }