refactor(web): migrate from Vike+React to SvelteKit

- Replace Vike+React with SvelteKit for simpler SSR and routing
- Update WASM build output paths from public/ to static/
- Add wasm-opt integration for WASM size optimization
- Streamline tooling: remove ESLint, Prettier configs (use defaults)
- Move build.rs to pacman-server/ (frontend no longer needs it)

pacman/web.build.ts

@@ -67,7 +67,7 @@ async function build(release: boolean, env: Record<string, string> | null) {
 
   const buildType = release ? "release" : "debug";
   const outputFolder = resolve(`target/wasm32-unknown-emscripten/${buildType}`);
-  const dist = resolve("web/public");
+  const dist = resolve("web/static");
 
   // The files to copy into 'dist'
   const files = [
@@ -98,7 +98,7 @@ async function build(release: boolean, env: Record<string, string> | null) {
   );
 
   // Copy the files to the dist folder
-  logger.debug("Copying Emscripten build artifacts into web/public");
+  logger.debug("Copying Emscripten build artifacts into web/static");
   await Promise.all(
     files.map(async ({ optional, src, dest }) => {
       match({ optional, exists: await fs.exists(src) })
@@ -120,9 +120,55 @@ async function build(release: boolean, env: Record<string, string> | null) {
     })
   );
 
+  // Optimize WASM binary for size using wasm-opt (if available)
+  const wasmPath = join(dist, "pacman.wasm");
+  await optimizeWasm(wasmPath);
+
   logger.info("Emscripten build complete");
 }
 
+/**
+ * Optimize a WASM binary using wasm-opt (from binaryen).
+ * Silently skips if wasm-opt is not installed.
+ *
+ * @param wasmPath - Path to the WASM file to optimize in-place.
+ */
+async function optimizeWasm(wasmPath: string): Promise<void> {
+  // Check if wasm-opt is available
+  const whichCmd = os.type === "windows" ? "where" : "which";
+  const checkResult = await $`${whichCmd} wasm-opt`.quiet().nothrow();
+  if (checkResult.exitCode !== 0) {
+    logger.debug(
+      "wasm-opt not found, skipping WASM optimization (install binaryen to enable)"
+    );
+    return;
+  }
+
+  const originalSize = (await fs.stat(wasmPath)).size;
+  logger.debug(`Optimizing WASM binary (original: ${formatBytes(originalSize)})`);
+
+  const result = await $`wasm-opt -Oz --strip-debug ${wasmPath} -o ${wasmPath}`.quiet().nothrow();
+  if (result.exitCode !== 0) {
+    logger.warn(`wasm-opt failed: ${result.stderr.toString()}`);
+    return;
+  }
+
+  const optimizedSize = (await fs.stat(wasmPath)).size;
+  const reduction = ((originalSize - optimizedSize) / originalSize) * 100;
+  logger.info(
+    `WASM optimized: ${formatBytes(originalSize)} -> ${formatBytes(optimizedSize)} (${reduction.toFixed(1)}% reduction)`
+  );
+}
+
+/**
+ * Format bytes as a human-readable string.
+ */
+function formatBytes(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KiB`;
+  return `${(bytes / (1024 * 1024)).toFixed(2)} MiB`;
+}
+
 // (Tailwind-related code removed; this script is now focused solely on the Emscripten build)
 
 /**