release: 5.0.0-alpha.1 - SQLite migrator (shadow write, JSON stays master)

Plan 02 abgeschlossen.
- better-sqlite3 + @types installiert
- src/main/infra/{db.ts, schema-v5.ts} - DbHandle wrapper + schema v5 (7 tables + 6 indices)
- src/main/domain/migrator.ts - JSON to SQLite (idempotent, fail-soft, .v4-backup)
- main.ts: lazy-require Aufruf im app.whenReady
- 106 unit tests (vorher 91, +15 fuer db + migrator)
- npm run test:e2e:release gruen

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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "twitch-vod-manager",
-  "version": "5.0.0-alpha.0",
+  "version": "5.0.0-alpha.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "twitch-vod-manager",
-      "version": "5.0.0-alpha.0",
+      "version": "5.0.0-alpha.1",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.6.0",

package.json

@@ -1,6 +1,6 @@
 {
   "name": "twitch-vod-manager",
-  "version": "5.0.0-alpha.0",
+  "version": "5.0.0-alpha.1",
   "description": "Twitch VOD Manager - Download Twitch VODs easily",
   "main": "dist/main.js",
   "author": "xRangerDE",