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.

turbo.json

@@ -6,34 +6,6 @@
     "build": {
       "dependsOn": ["^build"]
     },
-    "compile": {
-      "dependsOn": ["build"]
-    },
-    "compile:linux": {
-      "dependsOn": ["build"]
-    },
-    "compile:mac": {
-      "dependsOn": ["build"]
-    },
-    "compile:win": {
-      "dependsOn": ["build"]
-    },
-    "dist": {},
-    "dist:linux": {},
-    "dist:mac": {},
-    "dist:win": {},
-    "@furtherverse/desktop#dist": {
-      "dependsOn": ["@furtherverse/server#compile"]
-    },
-    "@furtherverse/desktop#dist:linux": {
-      "dependsOn": ["@furtherverse/server#compile:linux"]
-    },
-    "@furtherverse/desktop#dist:mac": {
-      "dependsOn": ["@furtherverse/server#compile:mac"]
-    },
-    "@furtherverse/desktop#dist:win": {
-      "dependsOn": ["@furtherverse/server#compile:win"]
-    },
     "dev": {
       "cache": false,
       "persistent": true