Add password reset link generation and welcome email functionality

- Introduce `generatePasswordResetLink` method in `users_o` for creating secure password reset links.
- Add `sendWelcomeEmailToCustomer` method to `email` class with support for attachments.
- Update `authRoute.php` to send welcome emails when creating new customers.
- Extend `sendEmail` to handle optional attachments and references.
- Disable PHP entrypoint in Dockerfile for improved flexibility.

services/nginx/app/objects/users_o.php

@@ -1478,4 +1478,28 @@ class users_o extends db
         }
     }
 
+    /**
+     * Generate password reset link for the user
+     * @return string The password reset link
+     * @throws Exception If the user is not selected
+     * @throws Exception If the user does not have an email address
+     */
+    public function generatePasswordResetLink(): string
+    {
+        self::requireSelected();
+        // Generate token
+        $token = customer_password_reset_keys_o::generateToken();
+
+        // Save token
+        $reset_key_o = new customer_password_reset_keys_o();
+        $reset_key_o->add([
+            'customer_id' => (int)$this->customer_number->value(),
+            'token' => (string)$token,
+            'note' => 'Requested via API'
+        ]);
+
+        // Generate reset link
+        return "https://truckwash.io/auth/password-reset/" . $token;
+    }
+
 }