Wave 1: add deps, crypto random utility, i18n helper, privacy fix, CI gates

- fix(deps): add zod and typescript to package.json
- feat(lib): add cryptographically secure random utility with TDD
- feat(lib): add client i18n helper with TDD
- fix(i18n): update privacy policy for crypto accuracy
- ci(deploy): add test and lint gates, fix SSH security

vitest.config.ts

@@ -1,6 +1,12 @@
 import { defineConfig } from "vitest/config";
+import path from "path";
 
 export default defineConfig({
+  resolve: {
+    alias: {
+      "@": path.resolve(import.meta.dirname, "./src"),
+    },
+  },
   test: {
     globals: true,
     environment: "node",