feat(server,web): system config for admin (#959)

* feat: add admin config module for user configured config, uses it for ffmpeg

* feat: add api endpoint to retrieve admin config settings and values

* feat: add settings panel to admin page on web (wip)

* feat: add api endpoint to update the admin config

* chore: re-generate openapi spec after rebase

* refactor: move from admin config to system config naming

* chore: move away from UseGuards to new @Authenticated decorator

* style: dark mode styling for lists and fix conflicting colors

* wip: 2 column design, no edit button

* refactor: system config

* chore: generate open api

* chore: rm broken test

* chore: cleanup types

* refactor: config module names

Co-authored-by: Zack Pollard <zackpollard@ymail.com>
Co-authored-by: Zack Pollard <zack.pollard@moonpig.com>

mobile/openapi/lib/api/system_config_api.dart

@@ -0,0 +1,106 @@
+//
+// AUTO-GENERATED FILE, DO NOT MODIFY!
+//
+// @dart=2.12
+
+// ignore_for_file: unused_element, unused_import
+// ignore_for_file: always_put_required_named_parameters_first
+// ignore_for_file: constant_identifier_names
+// ignore_for_file: lines_longer_than_80_chars
+
+part of openapi.api;
+
+
+class SystemConfigApi {
+  SystemConfigApi([ApiClient? apiClient]) : apiClient = apiClient ?? defaultApiClient;
+
+  final ApiClient apiClient;
+
+  /// Performs an HTTP 'GET /system-config' operation and returns the [Response].
+  Future<Response> getConfigWithHttpInfo() async {
+    // ignore: prefer_const_declarations
+    final path = r'/system-config';
+
+    // ignore: prefer_final_locals
+    Object? postBody;
+
+    final queryParams = <QueryParam>[];
+    final headerParams = <String, String>{};
+    final formParams = <String, String>{};
+
+    const contentTypes = <String>[];
+
+
+    return apiClient.invokeAPI(
+      path,
+      'GET',
+      queryParams,
+      postBody,
+      headerParams,
+      formParams,
+      contentTypes.isEmpty ? null : contentTypes.first,
+    );
+  }
+
+  Future<SystemConfigResponseDto?> getConfig() async {
+    final response = await getConfigWithHttpInfo();
+    if (response.statusCode >= HttpStatus.badRequest) {
+      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
+    }
+    // When a remote server returns no body with a status of 204, we shall not decode it.
+    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
+    // FormatException when trying to decode an empty string.
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
+      return await apiClient.deserializeAsync(await _decodeBodyBytes(response), 'SystemConfigResponseDto',) as SystemConfigResponseDto;
+    
+    }
+    return null;
+  }
+
+  /// Performs an HTTP 'PUT /system-config' operation and returns the [Response].
+  /// Parameters:
+  ///
+  /// * [Object] body (required):
+  Future<Response> updateConfigWithHttpInfo(Object body,) async {
+    // ignore: prefer_const_declarations
+    final path = r'/system-config';
+
+    // ignore: prefer_final_locals
+    Object? postBody = body;
+
+    final queryParams = <QueryParam>[];
+    final headerParams = <String, String>{};
+    final formParams = <String, String>{};
+
+    const contentTypes = <String>['application/json'];
+
+
+    return apiClient.invokeAPI(
+      path,
+      'PUT',
+      queryParams,
+      postBody,
+      headerParams,
+      formParams,
+      contentTypes.isEmpty ? null : contentTypes.first,
+    );
+  }
+
+  /// Parameters:
+  ///
+  /// * [Object] body (required):
+  Future<SystemConfigResponseDto?> updateConfig(Object body,) async {
+    final response = await updateConfigWithHttpInfo(body,);
+    if (response.statusCode >= HttpStatus.badRequest) {
+      throw ApiException(response.statusCode, await _decodeBodyBytes(response));
+    }
+    // When a remote server returns no body with a status of 204, we shall not decode it.
+    // At the time of writing this, `dart:convert` will throw an "Unexpected end of input"
+    // FormatException when trying to decode an empty string.
+    if (response.body.isNotEmpty && response.statusCode != HttpStatus.noContent) {
+      return await apiClient.deserializeAsync(await _decodeBodyBytes(response), 'SystemConfigResponseDto',) as SystemConfigResponseDto;
+    
+    }
+    return null;
+  }
+}