feat: add max upload size setting to UI & UI improvements (#1646)

* Add preliminar Windows support for both
development and production environments.

Default profile.Data will be set to "C:\ProgramData\memos" on Windows.
Folder will be created if it does not exist, as this behavior is
expected for Windows applications.

System service installation can be achieved with third-party tools,
explained in docs/windows-service.md.

Not sure if it's worth using https://github.com/kardianos/service
to make service support built-in.

This could be a nice addition alongside #1583 (add Windows artifacts)

* feat: improve Windows support

- Fix local file storage path handling on Windows

- Improve Windows dev script

* feat: add max upload size setting to UI & more

- feat: add max upload size setting to UI

- feat: max upload size setting is checked on UI during upload,
but also enforced by the server

- fix: overflowing mobile layout for Create SSO, Create Storage
and other Settings dialogs

- feat: add HelpButton component with some links to docs were appropriate

- remove LearnMore component in favor of HelpButton

- refactor: change some if/else to switch statements

- refactor: inline some err == nil checks

! Existing databases without the new setting 'max-upload-size-mib'
will show an upload error, but this can be user-fixed by simply
setting the value on system settings UI.

* improvements requested by @boojack

server/system.go

@@ -44,6 +44,7 @@ func (s *Server) registerSystemRoutes(g *echo.Group) {
 			AllowSignUp:        false,
 			IgnoreUpgrade:      false,
 			DisablePublicMemos: false,
+			MaxUploadSizeMiB:   32,
 			AdditionalStyle:    "",
 			AdditionalScript:   "",
 			CustomizedProfile: api.CustomizedProfile{
@@ -74,27 +75,40 @@ func (s *Server) registerSystemRoutes(g *echo.Group) {
 				continue
 			}
 
-			if systemSetting.Name == api.SystemSettingAllowSignUpName {
+			switch systemSetting.Name {
+			case api.SystemSettingAllowSignUpName:
 				systemStatus.AllowSignUp = baseValue.(bool)
-			} else if systemSetting.Name == api.SystemSettingIgnoreUpgradeName {
+
+			case api.SystemSettingIgnoreUpgradeName:
 				systemStatus.IgnoreUpgrade = baseValue.(bool)
-			} else if systemSetting.Name == api.SystemSettingDisablePublicMemosName {
+
+			case api.SystemSettingDisablePublicMemosName:
 				systemStatus.DisablePublicMemos = baseValue.(bool)
-			} else if systemSetting.Name == api.SystemSettingAdditionalStyleName {
+
+			case api.SystemSettingMaxUploadSizeMiBName:
+				systemStatus.MaxUploadSizeMiB = int(baseValue.(float64))
+
+			case api.SystemSettingAdditionalStyleName:
 				systemStatus.AdditionalStyle = baseValue.(string)
-			} else if systemSetting.Name == api.SystemSettingAdditionalScriptName {
+
+			case api.SystemSettingAdditionalScriptName:
 				systemStatus.AdditionalScript = baseValue.(string)
-			} else if systemSetting.Name == api.SystemSettingCustomizedProfileName {
+
+			case api.SystemSettingCustomizedProfileName:
 				customizedProfile := api.CustomizedProfile{}
-				err := json.Unmarshal([]byte(systemSetting.Value), &customizedProfile)
-				if err != nil {
+				if err := json.Unmarshal([]byte(systemSetting.Value), &customizedProfile); err != nil {
 					return echo.NewHTTPError(http.StatusInternalServerError, "Failed to unmarshal system setting customized profile value").SetInternal(err)
 				}
 				systemStatus.CustomizedProfile = customizedProfile
-			} else if systemSetting.Name == api.SystemSettingStorageServiceIDName {
+
+			case api.SystemSettingStorageServiceIDName:
 				systemStatus.StorageServiceID = int(baseValue.(float64))
-			} else if systemSetting.Name == api.SystemSettingLocalStoragePathName {
+
+			case api.SystemSettingLocalStoragePathName:
 				systemStatus.LocalStoragePath = baseValue.(string)
+
+			default:
+				log.Warn("Unknown system setting name", zap.String("setting name", systemSetting.Name.String()))
 			}
 		}