feat(stats): add launcher stats command and build integration

- Launcher stats subcommand with cleanup mode
- Stats frontend build integrated into Makefile
- CI workflow updated for stats package
- Config example updated with stats section
- mpv plugin menu entry for stats toggle

plugin/subminer/ui.lua

@@ -32,6 +32,7 @@ function M.create(ctx)
 			"Open options",
 			"Restart overlay",
 			"Check status",
+			"Stats",
 		}
 
 		local actions = {
@@ -53,6 +54,9 @@ function M.create(ctx)
 			function()
 				process.check_status()
 			end,
+			function()
+				mp.commandv("script-message", "subminer-stats-toggle")
+			end,
 		}
 
 		input.select({