Release 0.0.8: periodic update checks + "Run with admin" health checks

- GUI re-checks for new releases while running (every update_check_minutes,
  default 30; 0 disables), so a newly published version is detected without a
  restart; re-checks pause after an update is applied (awaiting restart)
- Health page "Run with admin" button: runs all checks incl. root-only SMART
  via `pkexec rigdoctor report --json`, so the full report is available from the
  UI (cancel keeps prior results)
- version 0.0.8, CHANGELOG

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "rigdoctor"
-version = "0.0.7"
+version = "0.0.8"
 description = "Modular hardware monitoring & crash diagnostics for Linux gamers."
 readme = "README.md"
 requires-python = ">=3.11"