feat(web, server): Ability to use config file instead of admin UI (#3836)

* implement method to read config file

* getConfig returns config file if present

* return isConfigFile for http requests

* disable elements if config file is used, show message if config file is set, copy existing config to clipboard

* fix allowing partial configuration files

* add new env variable to docs

* fix tests

* minor refactoring, address review

* adapt config type in frontend

* remove unnecessary imports

* move config file reading to system-config repo

* add documentation

* fix code formatting in system settings page

* add validator for config file

* fix formatting in docs

* update generated files

* throw error when trying to update config. e.g. via cli or api

* switch to feature flags for isConfigFile

* refactoring

* refactor: config file

* chore: open api

* feat: always show copy/export buttons

* fix: default flags

* refactor: copy to clipboard

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

web/src/lib/components/admin-page/settings/thumbnail/thumbnail-settings.svelte

@@ -10,6 +10,7 @@
   } from '$lib/components/shared-components/notification/notification';
 
   export let thumbnailConfig: SystemConfigThumbnailDto; // this is the config that is being edited
+  export let disabled = false;
 
   let savedConfig: SystemConfigThumbnailDto;
   let defaultConfig: SystemConfigThumbnailDto;
@@ -91,6 +92,7 @@
             ]}
             name="resolution"
             isEdited={!(thumbnailConfig.webpSize === savedConfig.webpSize)}
+            {disabled}
           />
 
           <SettingSelect
@@ -104,6 +106,7 @@
             ]}
             name="resolution"
             isEdited={!(thumbnailConfig.jpegSize === savedConfig.jpegSize)}
+            {disabled}
           />
         </div>
 
@@ -113,6 +116,7 @@
             on:save={saveSetting}
             on:reset-to-default={resetToDefault}
             showResetToDefault={!isEqual(savedConfig, defaultConfig)}
+            {disabled}
           />
         </div>
       </form>