feat(audit): Batch 23 — settings key renames with migration (CC1) + config.ts (CC11)

CC1: customCommandEnabled→enableCustomCommands, downloadArchive→
useDownloadArchive, clipboardWatch→watchClipboard, sidebarCollapsed→
isSidebarCollapsed, hardwareAcceleration→useHardwareAcceleration,
videoDir/audioDir→videoFolder/audioFolder (+ chooseDir/clearDir store
actions → chooseFolder/clearFolder). Rename map in settingsMigration.ts
(pure, unit-tested incl. pre-rename backup fixture), applied as an
idempotent on-disk shim at store open and on backup import so old
settings.json and old backups both keep working.

CC11: update host/owner/repo + release API moved to src/main/config.ts.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

test/real-download.integration.test.ts

@@ -368,7 +368,7 @@ describe.skipIf(!RUN)('real yt-dlp downloads (buildArgs end-to-end)', () => {
     expect(base, 'restricted to [A-Za-z0-9._-]').toMatch(/^[A-Za-z0-9._-]+$/)
   }, 240_000)
 
-  it('downloadArchive: a second run of the same URL is skipped via the archive', () => {
+  it('useDownloadArchive: a second run of the same URL is skipped via the archive', () => {
     const archive = join(outDir, 'archive.txt')
     const mk = (id: string): string[] =>
       buildArgs({