- jwt without parameter now generate a real jwt
- keep length parameter as is for backward compatibility
- add secret and payload parameters
- payload properties iss, iat, exp are automaticly set if not provided
- Implement generateJwt function for creating JWT tokens
- Add support for 'jwt' and 'jwt:length' template variables
- Introduce new base64 and password generation shortcuts
- Enhance template variable processing with additional utility functions
- Delete all template-related files in `apps/dokploy/templates`
- Remove template image files from `apps/dokploy/public/templates`
- Update server-side template processing with new implementation
- Clean up unused configuration and utility files