fix: adapt code to modernized libraries

- Migrate validation.ts from class-transformer/class-validator to Zod
- Apply Biome auto-fixes (import sorting, nodejs protocol)
- Fix duplicate type identifier in validation.ts

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

src/mock-crc.ts

@@ -8,7 +8,7 @@ for (let i = 0; i < 256; i++) {
   CRC_TABLE[i] = r >>> 0;
 }
 
-const Module = require("module");
+const Module = require("node:module");
 const originalRequire = Module.prototype.require;
 Module.prototype.require = function (id: string) {
   if (id === "node-crc") {