Add missing app files and fix Docker configuration

- Add all PHP app files (controllers, middleware, providers, models, enums)
  that were previously gitignored via app/.gitignore wildcard
- Fix app/.gitignore to no longer ignore all files
- Fix docker-compose.yml: use named volume for postgres to avoid chown permission errors on server
- Fix Dockerfile: use --classmap-authoritative for composer dump-autoload

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

app/Models/Debit.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class Debit extends Model
+{
+    public static $NOPAID = 'nopaid';
+    public static $PAID = 'paid';
+    public static $REJECTED = 'rejected';
+
+    protected $fillable = [
+        'appraiser_id',
+        'order_id',
+        'cost',
+        'customer',
+        'expired',
+        'order_type',
+        'status',
+    ];
+}