chore: prune unused apps and services for the moeka fork

- Remove stage-tamagotchi, stage-pocket, server, and engine workspaces with their workflows, addons, and docs
- Switch the toolchain from pnpm to bun, replace lockfiles with bun.lock
- Rewrite remaining product references to Moeka

packages/font-xiaolai/package.json

@@ -2,7 +2,7 @@
   "name": "@proj-airi/font-xiaolai",
   "type": "module",
   "version": "0.12.0-beta.5",
-  "description": "Essential CSS for font, Xiaolai (小赖字体 / 小賴字體 / シャオライ / Xiaolai Font), used by Project AIRI",
+  "description": "Essential CSS for font, Xiaolai (小赖字体 / 小賴字體 / シャオライ / Xiaolai Font), used by Project Moeka",
   "author": {
     "name": "ʟxɢᴡ",
     "email": "calxgw2018@gmail.com",
@@ -24,7 +24,7 @@
   },
   "main": "./dist/index.css",
   "scripts": {
-    "dev": "pnpm run build",
+    "dev": "bun run build",
     "build": "tsdown"
   }
 }