Add TIFF parser and buffer-based image size APIs

Introduce a TIFF parser and integrate it into the image detection/size parsing pipeline. Add buffer-based APIs (detectImageTypeFromBuffer, imageSizeFromBuffer, imageSizeFromBufferFallBack) and a helper to convert Buffer to a Readable stream; refactor parser registry into a type-to-parser map and a first-byte fast-path map for quicker detection. Harden WebP parsing with safer length checks. Add sample image resources and a comprehensive Vitest test suite (packages/napcat-test) with updated package dependency and resolve aliases. pnpm-lock updated to link the new package.

packages/napcat-test/package.json

@@ -11,6 +11,7 @@
     "vitest": "^4.0.9"
   },
   "dependencies": {
-    "napcat-core": "workspace:*"
+    "napcat-core": "workspace:*",
+    "napcat-image-size": "workspace:*"
   }
 }