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

web/vite-env.d.ts

@@ -0,0 +1,11 @@
+/// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+  readonly VITE_PACMAN_VERSION: string;
+  readonly VITE_API_URL: string;
+  readonly VITE_API_TARGET: string;
+}
+
+interface ImportMeta {
+  readonly env: ImportMetaEnv;
+}