Add a new xmcl task system and instance-import workflow. Introduces electron/core/task.ts with @xmcl/task executors (install, sims), task lifecycle IPC (start/pause/resume/cancel) and stage mapping. Detect mod loaders in instance scanner and add importExistingInstance with IPC. Update front-end task store, types and UI (TaskButton, TaskCard, TaskQueue, TaskDebug) to support paused state, xmcl path/state and pause/resume actions. Improve game-dir UI with loader badges and bulk import. Small UX/dialog tweaks (alert-dialog, About) and dependency/pnpm workspace updates. Adds Koring.yml theme default.
Route Minecraft/Fabric/Forge downloads through BMCLAPI mirror and update installer logic. Added mirror rewrite utility (rewriteToMirror), mirror-aware downloadFile, and mirrorFetch; switched version manifest and metadata endpoints to bmclapi2.bangbang93.com and wired maven/assets hosts into xmcl/installer calls. Cleaned up compiled electron JS files and consolidated runtime files under electron-dist; updated electron-builder.yml (compression, asar, NSIS settings, license/installer assets and languages). Minor env/path changes (VITE_APP_ICON paths), added .npmrc (electron_mirror), new Koring.yml, pnpm-workspace and public installer assets. Also added/updated multiple frontend pages, store components, and TypeScript handlers to integrate the changes.
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