revert(version): undo version refactor and tests, keep single-file change

Keep the User-Agent change as a single edit to
packages/core/src/infrastructure/http/request.ts. Remove the @homarr/version
package, the consumer migrations, and the unit tests.

packages/core/package.json

@@ -36,7 +36,6 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@homarr/version": "workspace:^0.1.0",
     "@t3-oss/env-nextjs": "catalog:",
     "better-sqlite3": "catalog:",
     "dns-caching": "catalog:",