refactor: decentralize turbo task config — move compile/dist to workspace turbo.json

Sink package-specific tasks from root turbo.json into workspace configs:
- compile/compile:* → apps/server/turbo.json (only server compiles binaries)
- dist/dist:* → apps/desktop/turbo.json (only desktop distributes)
- Cross-package deps (desktop→server#compile) owned by desktop config
- Desktop dist scripts no longer bypass Turbo by calling bun run build

Root turbo.json reduced from 16 to 4 generic lifecycle tasks.

apps/desktop/package.json

@@ -10,10 +10,10 @@
   "scripts": {
     "build": "electron-vite build",
     "dev": "electron-vite dev",
-    "dist": "bun run build && electron-builder --config",
-    "dist:linux": "bun run build && electron-builder --linux --config",
-    "dist:mac": "bun run build && electron-builder --mac --config",
-    "dist:win": "bun run build && electron-builder --win --config",
+    "dist": "electron-builder --config",
+    "dist:linux": "electron-builder --linux --config",
+    "dist:mac": "electron-builder --mac --config",
+    "dist:win": "electron-builder --win --config",
     "fix": "biome check --write",
     "typecheck": "tsc --noEmit"
   },