initial: dungeon crawler with Bun + TypeScript modular architecture

- 19 TypeScript modules under src/ (constants, entities, room, game, render)
- Canvas 2D rendering with dark fantasy palette
- Room-based navigation, random 7x7 map generation
- Two combat modes: ranged (pistol) and melee (knife)
- Wall collision with door opening support
- Minimap, HP bar, enemy AI
- Bun build pipeline: src/main.ts -> dist/main.js + dist/index.html

package.json

@@ -0,0 +1,12 @@
+{
+  "name": "dungeon-crawl",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "bun build src/main.ts --outdir dist --target browser --watch",
+    "build": "bun run build.ts",
+    "serve": "bun build src/main.ts --outdir dist --target browser && cp src/index.html dist/",
+    "start": "bun run build && echo 'open dist/index.html'"
+  }
+}