feat(studio): hub maintenance panel with reset action (v0.45.0)

UI parity with the platform CLI: `fai reset` (v0.10.93) is now
reachable from Settings. The panel shows the reset blurb plus
two checkboxes mirroring the CLI flags (Keep modules / Keep
audit log + saved flows), then a destructive-styled "Reset hub
state" button. Click goes through a confirm dialog before
SystemActions.faiReset is invoked.

After the CLI returns, Studio bounces its gRPC channel against
the same endpoint (the daemon restarts on the same channel +
port, so no Settings change needed) and reloads every panel:
channel status, system AI, MCP clients, n8n endpoints, registry
token. Output (success or failure) is shown in a copyable error
box so any unexpected stderr lands somewhere the operator can
paste from.

Sits at the bottom of the dialog under "HUB MAINTENANCE",
separated from the everyday config so a destructive button
doesn't crowd the day-to-day controls.

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

pubspec.yaml

@@ -1,7 +1,7 @@
 name: fai_studio
 description: "F∆I Studio — desktop GUI for the F∆I hub"
 publish_to: 'none'
-version: 0.44.0
+version: 0.45.0
 
 environment:
   sdk: ^3.11.0-200.1.beta