chore: add changelog for v1.0.0

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.0] - 2025-11-14
+### Added
+- Compile-time transformer that rewrites `v-can` / `v-cannot` into optimized `v-if` guards.
+- Global runtime plugin that injects the `can` proxy, `$can`, and the host-provided `__can__` checker.
+- Permission-driven type generation with `types/nuxt-can.d.ts` and Nuxt schema augmentation.
+- Playground showcasing multiple directive combinations, permission toggles, and a live summary.
+- Test fixtures plus Vitest suite covering directive success paths and DX errors.
+- MIT license.
+
+### Docs
+- English README describing usage, playground, and contribution guide.
+- Roadmap and release prep guidance.
+
+[1.0.0]: https://github.com/your-org/nuxt-can/releases/tag/v1.0.0