feat(web): add cache busting with version-based asset loading

- Inject git hash via Vite plugin for cache-busting WASM/JS assets
- Enable Emscripten assertions for better runtime error messages
- Log Emscripten runtime init for debugging filesystem readiness
- Expand dockerignore to exclude web build artifacts

.cargo/config.toml

@@ -7,6 +7,8 @@ rustflags = [
     "link-args=-sUSE_SDL=2 -sUSE_SDL_IMAGE=2 -sUSE_SDL_MIXER=2 -sUSE_OGG=1 -sUSE_SDL_GFX=2 -sUSE_SDL_TTF=2 -sSDL2_IMAGE_FORMATS=['png']",
     "-C",
     "link-args=--preload-file pacman/assets/game/",
+    "-C",
+    "link-args=-sASSERTIONS=1",
 ]
 runner = "node"