feat(studio): module uninstall + Doctor daemon control (v0.17.0)

UI parity for Windows operators who never touch a shell:

- Module sheet gains an Uninstall button at the bottom.
  Two-step confirmation, then calls UninstallModule + closes
  the sheet + refreshes the Modules page.

- Doctor page picks up two new sections:
  * Daemon files — log / config / audit DB / modules /
    flows / pid, each with a one-click "Open" button that
    shells out to the OS handler (open / xdg-open /
    explorer).
  * Daemon control — Restart / Stop / Status buttons that
    spawn `fai daemon …`. Captured stdout/stderr renders
    inline so the operator sees what happened.

- Update banner gains an "Apply update" button that spawns
  `fai update apply --channel <c>`. The previous version
  showed the command as text — Windows users had no way to
  execute it.

- Event log panel gains a "Verify now" button that re-runs
  the chain check (via the existing doctor refresh).

New SystemActions helper resolves the `fai` binary via
$FAI_BIN → PATH → `~/.fai/bin/fai` (or the Windows
equivalent), so the buttons work whether the operator
restarted their shell after installing or not.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/pages/modules.dart

@@ -74,7 +74,11 @@ class _ModulesPageState extends State<ModulesPage> {
             itemBuilder: (context, i) {
               final m = modules[i];
               return GestureDetector(
-                onTap: () => FaiModuleSheet.show(context, m.name),
+                onTap: () async {
+                  final uninstalled =
+                      await FaiModuleSheet.show(context, m.name);
+                  if (uninstalled) _refresh();
+                },
                 behavior: HitTestBehavior.opaque,
                 child: MouseRegion(
                   cursor: SystemMouseCursors.click,