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/server/turbo.json

@@ -7,15 +7,19 @@
       "outputs": [".output/**"]
     },
     "compile": {
+      "dependsOn": ["build"],
       "outputs": ["out/**"]
     },
     "compile:linux": {
+      "dependsOn": ["build"],
       "outputs": ["out/**"]
     },
     "compile:mac": {
+      "dependsOn": ["build"],
       "outputs": ["out/**"]
     },
     "compile:win": {
+      "dependsOn": ["build"],
       "outputs": ["out/**"]
     }
   }