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>

server/libs/database/src/entities/system-config.entity.ts

@@ -0,0 +1,27 @@
+import { Column, Entity, PrimaryColumn } from 'typeorm';
+
+@Entity('system_config')
+export class SystemConfigEntity {
+  @PrimaryColumn()
+  key!: SystemConfigKey;
+
+  @Column({ type: 'varchar', nullable: true })
+  value!: SystemConfigValue;
+}
+
+export type SystemConfig = SystemConfigEntity[];
+
+export enum SystemConfigKey {
+  FFMPEG_CRF = 'ffmpeg_crf',
+  FFMPEG_PRESET = 'ffmpeg_preset',
+  FFMPEG_TARGET_VIDEO_CODEC = 'ffmpeg_target_video_codec',
+  FFMPEG_TARGET_AUDIO_CODEC = 'ffmpeg_target_audio_codec',
+  FFMPEG_TARGET_SCALING = 'ffmpeg_target_scaling',
+}
+
+export type SystemConfigValue = string | null;
+
+export interface SystemConfigItem {
+  key: SystemConfigKey;
+  value: SystemConfigValue;
+}