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

.dockerignore

@@ -6,6 +6,14 @@
 /pacman/assets
 /assets
 
+# Web/Node artifacts
+node_modules
+/web/node_modules
+/web/dist
+.next
+.nuxt
+.cache
+
 # Development files
 /.git
 /*.md