refactor: store gitea ssh key in homedir special folder

...ck-plugins/deadlock-extension/src/core/callApi.service.ts

deadlock-plugins/deadlock-extension/src/core/config.ts

deadlock-plugins/deadlock-extension/src/core/controller.ts

...ock-plugins/deadlock-extension/src/core/extensionStore.ts

deadlock-plugins/deadlock-extension/src/core/mission.ts

...lock-plugins/deadlock-extension/src/core/sshKeyManager.ts