fix: exit GUI and mini mode when the server shuts down on SIGTERM

[0xbrayo]

On SIGINT/SIGTERM (and SIGHUP on Unix), Rocket shuts the server down gracefully. Daemon mode then stops the modules and exits. GUI mode drops the launch handle, though, and mini mode ignores a clean shutdown. The process and its modules keep running without a server, and only the tray's Quit or SIGKILL ends them.

This watches the Rocket task in both modes. Once it finishes, they stop the modules and exit, with code 1 if the server failed.

GUI mode now also exits if the server fails. Before, it stayed open with a dead dashboard; mini and daemon mode already exited.

Testing

• Mini mode under --testing with real modules, sending SIGTERM:
  • Before: the process was still running 15 s later.
  • After: it exits with code 0 after about 7 s (Rocket's shutdown grace period), and all modules are gone.
• GUI mode was compiled and linted but not launched: on macOS its single-instance check hands off to an already-running installed instance.
• cargo fmt --check and cargo clippy --all-targets -D warnings pass.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge; both changed runtime paths now pair server termination with module cleanup and the expected process status.

Summary

This PR aligns embedded-server shutdown handling across the desktop, mini, and daemon runtime modes.

• Full GUI mode now watches the Rocket task, stops managed modules when it ends, and exits with a status reflecting success or failure.
• Mini mode now treats clean Rocket shutdown as an explicit event, stops managed modules, and exits its event loop.
• Server errors and task panics continue to produce non-zero process exits.

Diagram

sequenceDiagram
    participant Signal as SIGINT/SIGTERM/SIGHUP
    participant Rocket as Embedded Rocket server
    participant Runtime as GUI or mini runtime
    participant Manager as Module manager
    participant Process as Application process

    Signal->>Rocket: Request graceful shutdown
    Rocket-->>Runtime: Server task completes
    Runtime->>Manager: stop_modules()
    alt Clean server shutdown
        Runtime->>Process: Exit with status 0
    else Server error or task panic
        Runtime->>Process: Exit with status 1
    end

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