chore(admin): remove useless config diff (#12545)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
  - Added a GraphQL mutation to validate multiple app configuration updates, returning detailed validation results for each item.
  - Extended the API schema to support validation feedback, enabling client-side checks before applying changes.
  - Introduced a detailed, parameterized error message system for configuration validation errors.
  - Enabled validation of configuration inputs via the admin UI with clear, descriptive error messages.

- **Improvements**
  - Enhanced error reporting with specific, context-rich messages for invalid app configurations.
  - Simplified admin settings UI by removing the confirmation dialog and streamlining save actions.
  - Improved clarity and maintainability of validation logic and error handling components.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/backend/server/src/base/config/__tests__/config.spec.ts

@@ -1,6 +1,7 @@
 import test from 'ava';
 
 import { createModule } from '../../../__tests__/create-module';
+import { InvalidAppConfig } from '../../error';
 import { ConfigFactory, ConfigModule } from '..';
 import { Config } from '../config';
 import { override } from '../register';
@@ -64,30 +65,29 @@ test('should override config', async t => {
 test('should validate config', t => {
   const config = module.get(ConfigFactory);
 
-  t.notThrows(() =>
+  t.is(
     config.validate([
       {
         module: 'auth',
         key: 'passwordRequirements',
         value: { max: 10, min: 6 },
       },
-    ])
+    ]),
+    null
   );
 
-  t.throws(
-    () =>
-      config.validate([
-        {
-          module: 'auth',
-          key: 'passwordRequirements',
-          value: { max: 10, min: 10 },
-        },
-      ]),
+  const [error] = config.validate([
     {
-      message: `Invalid config for module [auth] with key [passwordRequirements]
-Value: {"max":10,"min":10}
-Error: Minimum length of password must be less than maximum length`,
-    }
+      module: 'auth',
+      key: 'passwordRequirements',
+      value: { max: 10, min: 10 },
+    },
+  ])!;
+
+  t.true(error instanceof InvalidAppConfig);
+  t.is(
+    error.message,
+    'Invalid app config for module `auth` with key `passwordRequirements`. Minimum length of password must be less than maximum length.'
   );
 });
 

packages/backend/server/src/base/config/factory.ts

@@ -33,13 +33,17 @@ export class ConfigFactory {
   }
 
   validate(updates: Array<{ module: string; key: string; value: any }>) {
-    const errors: string[] = [];
+    const errors: InvalidAppConfig[] = [];
 
     updates.forEach(update => {
       const descriptor = APP_CONFIG_DESCRIPTORS[update.module]?.[update.key];
       if (!descriptor) {
         errors.push(
-          `Invalid config for module [${update.module}] with unknown key [${update.key}]`
+          new InvalidAppConfig({
+            module: update.module,
+            key: update.key,
+            hint: `Unknown config [${update.key}]`,
+          })
         );
         return;
       }
@@ -47,16 +51,18 @@ export class ConfigFactory {
       const { success, error } = descriptor.validate(update.value);
       if (!success) {
         error.issues.forEach(issue => {
-          errors.push(`Invalid config for module [${update.module}] with key [${update.key}]
-Value: ${JSON.stringify(update.value)}
-Error: ${issue.message}`);
+          errors.push(
+            new InvalidAppConfig({
+              module: update.module,
+              key: update.key,
+              hint: issue.message,
+            })
+          );
         });
       }
     });
 
-    if (errors.length > 0) {
-      throw new InvalidAppConfig(errors.join('\n'));
-    }
+    return errors.length > 0 ? errors : null;
   }
 
   private loadDefault() {