Restructure into pnpm monorepo with game shell, docs, and SpacetimeDB backend

- Restructure flat static prototype into pnpm workspace monorepo
- apps/game: playable shell with R3F 3D scene, HUD, SpacetimeDB connection
- apps/docs: design docs and prototypes
- apps/site: landing page
- packages/ui: shared Button and Panel primitives
- services/spacetimedb: backend module (9 tables, 11 reducers)
- Archive legacy static files to archive/legacy-static/
- Game loop: connect, undock, target, approach, dock, mine, sell
- Add pnpm-workspace.yaml, tsconfig.base.json, spacetime.json

package.json

@@ -1,29 +1,16 @@
 {
-  "name": "space-game",
+  "name": "void-nav",
   "private": true,
   "version": "0.1.0",
   "type": "module",
   "scripts": {
-    "dev": "vite --host 0.0.0.0",
-    "build": "tsc --noEmit && vite build",
-    "preview": "vite preview --host 0.0.0.0"
-  },
-  "dependencies": {
-    "@react-three/drei": "^9.122.0",
-    "@react-three/fiber": "^8.17.10",
-    "@tailwindcss/vite": "^4.3.0",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
-    "react-router-dom": "^6.30.1",
-    "tailwindcss": "^4.3.0",
-    "three": "^0.160.0",
-    "vite": "^7.0.0"
-  },
-  "devDependencies": {
-    "@types/react": "^18.3.23",
-    "@types/react-dom": "^18.3.7",
-    "@types/three": "^0.160.0",
-    "typescript": "^5.8.3"
+    "dev:docs": "pnpm --filter @void-nav/docs dev --port 5173",
+    "dev:site": "pnpm --filter @void-nav/site dev --port 5174",
+    "dev:game": "pnpm --filter @void-nav/game dev --port 5175",
+    "dev:db": "spacetime dev --server local",
+    "build": "pnpm -r --if-present build",
+    "check": "pnpm -r --if-present check",
+    "generate:bindings": "spacetime generate"
   },
   "packageManager": "pnpm@9.15.0"
 }