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>

src/main/config.ts

@@ -0,0 +1,15 @@
+/**
+ * Build/host configuration (CC11): the deploy-specific constants that identify
+ * WHERE this build talks to, separated from runtime tunables (constants.ts —
+ * timeouts, caps, tickers) and from user settings (settings.ts). Retarget a
+ * fork's update source by editing these three values.
+ *
+ * IMPORTANT: the update repo's releases must be ANONYMOUSLY readable — i.e. a
+ * public repo on a Gitea instance that permits anonymous API + downloads.
+ * AeroFetch never ships a token; on a sign-in-required instance the update
+ * check simply reports that it couldn't reach the server.
+ */
+export const UPDATE_HOST = 'https://gitea.netbird.zimspace.uk:5938'
+export const UPDATE_OWNER = 'debont80'
+export const UPDATE_REPO = 'AeroFetch'
+export const RELEASE_API = `${UPDATE_HOST}/api/v1/repos/${UPDATE_OWNER}/${UPDATE_REPO}/releases/latest`