perf: reduce 3D runtime artifacts (#7)

apps/viewer-3d/tools/copy-decoders.mjs

@@ -1,14 +1,10 @@
-// Copies Draco + KTX2/Basis decoder WASM from three.js into public/ so the
-// runtime paths /draco/ and /basis/ resolve (version-matched to installed three).
-// Also copies the web-ifc single-thread WASM to public/web-ifc/ for the IFC path.
-// Runs automatically via `npm install` (postinstall). Safe to re-run.
+// IFC single-thread WASM을 public/에 staging합니다.
+// `npm install`의 postinstall에서 자동 실행되며 반복 실행해도 같은 결과를 만듭니다.
 import {
   chmodSync,
-  cpSync,
   copyFileSync,
   existsSync,
   mkdirSync,
-  readdirSync,
   rmSync,
 } from 'node:fs';
 import { dirname, resolve } from 'node:path';
@@ -17,54 +13,18 @@ import { fileURLToPath } from 'node:url';
 const __dirname = dirname(fileURLToPath(import.meta.url));
 const root = resolve(__dirname, '..');
 
-function normalizePublicModes(directory) {
-  chmodSync(directory, 0o755);
-  for (const entry of readdirSync(directory, { withFileTypes: true })) {
-    const path = resolve(directory, entry.name);
-    if (entry.isDirectory()) normalizePublicModes(path);
-    else if (entry.isFile()) chmodSync(path, 0o644);
-  }
-}
-
-const threeEntry = fileURLToPath(import.meta.resolve('three'));
-const threeRoot = resolve(dirname(threeEntry), '..');
-const libs = resolve(threeRoot, 'examples/jsm/libs');
-const targets = [
-  [resolve(libs, 'draco/gltf'), resolve(root, 'public/draco')],
-  [resolve(libs, 'basis'), resolve(root, 'public/basis')],
-];
-
-if (!existsSync(libs)) {
-  console.warn('[copy-decoders] three not installed yet — skipping (will run on next install).');
-  process.exit(0);
-}
-
-for (const [src, dest] of targets) {
-  if (!existsSync(src)) {
-    console.warn(`[copy-decoders] source missing: ${src}`);
-    continue;
-  }
-  rmSync(dest, { force: true, recursive: true });
-  mkdirSync(dest, { recursive: true });
-  cpSync(src, dest, { recursive: true });
-  normalizePublicModes(dest);
-  console.log(`[copy-decoders] ${src} -> ${dest}`);
-}
-
-// web-ifc single-thread WASM (+ MT build if present) for the IFC load path.
+// 현재 IFC 경로는 COOP/COEP가 필요 없는 single-thread WASM만 사용합니다.
 const ifcEntry = fileURLToPath(import.meta.resolve('web-ifc'));
 const ifcSrcDir = dirname(ifcEntry);
 const ifcDest = resolve(root, 'public/web-ifc');
 if (existsSync(ifcSrcDir)) {
+  rmSync(ifcDest, { force: true, recursive: true });
   mkdirSync(ifcDest, { recursive: true });
-  for (const wasm of ['web-ifc.wasm', 'web-ifc-mt.wasm']) {
-    const src = resolve(ifcSrcDir, wasm);
-    if (!existsSync(src)) continue;
-    const dest = resolve(ifcDest, wasm);
-    copyFileSync(src, dest);
-    chmodSync(dest, 0o644);
-    console.log(`[copy-decoders] ${src} -> ${dest}`);
-  }
+  const src = resolve(ifcSrcDir, 'web-ifc.wasm');
+  const dest = resolve(ifcDest, 'web-ifc.wasm');
+  copyFileSync(src, dest);
+  chmodSync(dest, 0o644);
+  console.log(`[copy-decoders] ${src} -> ${dest}`);
 } else {
   console.warn('[copy-decoders] web-ifc not installed yet — skipping IFC wasm.');
 }