feat: generate thumbhash for assets

package.json

@@ -3,7 +3,8 @@
   "version": "1.0.0",
   "type": "module",
   "scripts": {
-    "start": "bun src/index.ts",
+    "start": "bun src/index.ts metadata",
+    "start:thumb": "bun src/index.ts thumb",
     "typecheck": "tsc",
     "lint": "eslint --cache --ext .",
     "lint:fix": "eslint --cache --ext . --fix"
@@ -25,12 +26,14 @@
   },
   "dependencies": {
     "@guiiai/logg": "^1.2.5",
+    "@napi-rs/canvas": "^0.1.82",
     "@types/js-yaml": "^4.0.9",
     "@types/node": "^24.10.0",
     "bun": "^1.3.2",
     "es-toolkit": "^1.41.0",
     "fast-xml-parser": "^5.3.1",
     "glob": "^11.0.3",
+    "thumbhash-node": "^0.1.3",
     "tinypool": "^2.0.0",
     "zod": "^4.1.12"
   }