Implement a new method `start_all` in `BootstrapManager` to start all
components using the `PackageManager`.
This method creates a new `PackageManager` instance and uses it to start
each component in a predefined list.
--- Add remove_local for PackageManager
Remove component specific code
The specific code for component 'tables' has been removed from the
`remove_local` method in `PackageManager`.
The method now simply removes the binary directory for the component.
--- Implement start for PackageManager
Add a new method `start` to `PackageManager` to start a component.
This method takes a component name as an argument and uses the
`exec_cmd` for that component to spawn a new process.
If the component is not found, it returns an error.
- Split package manager into separate modules
- Expose only the installer API
- Simplify BootstrapManager to install components and load config
- Pin ureq to 3.1.2 and add ureq‑proto crate
- Clean up configuration code and remove legacy comments
- Update helper scripts and server start command formatting
Replace `thread_rng` with `rng` and use `random_range` for character
selection. Rename the `component` argument to `_component` in
`PackageManager::download_binary` to suppress an unused‑parameter
warning.
