Fixed some bugs.

- Added "Guest Mode" There is an option for Guest Mode in the upper right corner when you click on the APP login & registration interface. 1. When users don't want to register, they can use Guest Mode to experience the APP. 2. For some overseas users who can't register temporarily (due to WiFi issues or not receiving verification codes), they can be guided to use Guest Mode. 3. Currently, there are no functional experience restrictions in Guest Mode. After connecting to the host via Bluetooth in Guest Mode, [Training Mode, Match Mode, Custom Mode] can be used, while [Teaching Videos, Personal Information, Instruction Manual, OTA Upgrade] cannot be used and the information will not be displayed. 4. In Guest Mode, the information of saving ball shapes in Training Mode and saving ball paths in Custom Mode can be saved. (Saved on the APP side. After registering an account, the parameters in Guest Mode will be erased and not saved to the account.) - Added "Custom Mode" - Custom ball path function 1. Users can customize 1 - 10 balls to create a custom ball path for serving. 2. Each custom ball can be selected from "Basic Ball Shape", "Fixed Landing Point Ball Shape", "Saved Ball Shape", and users can also customize and adjust non - app fixed ball shapes. 3. Before serving the custom - shaped balls, users can choose the number of serving groups and the interval time between each group. 4. Custom ball paths can be saved. - Added parameter adjustment method Use "+" and "-" to adjust parameters. - Added "Save Ball Shape" function The balls adjusted by users can have their parameters saved to "Ball Shape 1", ……, "Ball Shape 5". The names of "Ball Shape 1", ……, "Ball Shape 5" can be changed. - Amended content 1. In parameter adjustment, the "Serve Interval" is updated to "2 - 8s". 2. After adjusting the serving parameters, users can directly select "Re - serve" without having to pause first and then send new parameters. 3. The data display of the serving parameter sliding button is changed to be shown on the slider. 4. For battery level display, in the previous version, only 86% was shown. After the update, the parameter will be displayed according to the actual battery level. - Updated match ball paths Six new ball paths are updated and divided into three levels.