docs: comprehensive documentation refactor and internationalization

Major changes:
- Restructure docs/ directory with bilingual support (EN/ZH)
  - guide.md / guide.zh-CN.md - Technical guide
  - deployment.md / deployment.zh-CN.md - Deployment guide
  - signaling.md / signaling.zh-CN.md - Protocol specification
  - api.md / api.zh-CN.md - API reference
  - troubleshooting.md / troubleshooting.zh-CN.md - Troubleshooting guide
  - README.md / README.zh-CN.md - Documentation index

- Reorganize changelog/ with semantic versioning
  - 1.0.0.md - Production release
  - 0.9.0.md - Major refactoring
  - 0.8.0.md - DataChannel & Mesh
  - 0.1.0.md - Project infrastructure
  - Archive legacy date-based changelogs

- Professionalize README.md and README.zh-CN.md
  - Add table of contents
  - Enhanced badges and formatting
  - Better navigation and structure

- Update CHANGELOG.md to reference new structure

Release: v1.0.0

Author: shijiashuai

CHANGELOG.md

@@ -1,20 +1,66 @@
 ---
 layout: default
-title: 变更日志 — WebRTC
-description: WebRTC 项目各版本变更记录
+title: Changelog — WebRTC
+description: WebRTC project version history and change records
 ---
 
-[← 返回首页]({{ site.baseurl }}/)
+[← Back to Home]({{ site.baseurl }}/)
 
-# 变更日志
+# Changelog
 
-所有重要变更均记录在 [`changelog/`](changelog/) 目录中，按日期倒序排列。
+All notable changes to this project are documented in the [`changelog/`](changelog/) directory.
 
-| 日期 | 摘要 |
-|:-----|:-----|
-| [2026-03-10](changelog/2026-03-10_pages-optimization.md) | Pages 工作流优化、CI badge 修正、_config.yml 清理、Pages 徽章 |
-| [2026-03-09](changelog/2026-03-09_pages-and-quality.md) | GitHub Pages 全面优化、golangci-lint、测试覆盖率增强、文档同步 |
-| [2026-03-09](changelog/2026-03-09_stability-and-security.md) | writePump 协程泄露修复、房间/人数上限、WebSocket 自动重连 |
-| [2026-02-13](changelog/2026-02-13.md) | 全面优化与重构（后端提取 broadcastMembers、前端重构、CI 增强、Docker） |
-| [2025-12-18](changelog/2025-12-18.md) | DataChannel 聊天、成员列表、Mesh 多人通话、Origin 校验、心跳 |
-| [2025-02-13](changelog/2025-02-13_project-infrastructure.md) | README badges 添加 |
+---
+
+## Version History
+
+| Version | Date | Description |
+|:--------|:-----|:------------|
+| [v1.0.0](changelog/1.0.0.md) | 2026-04-16 | 🎉 Production release with bilingual documentation |
+| [v0.9.0](changelog/0.9.0.md) | 2026-02-13 | Major refactoring, modular architecture |
+| [v0.8.0](changelog/0.8.0.md) | 2025-12-18 | DataChannel chat, Mesh multi-party calls |
+| [v0.1.0](changelog/0.1.0.md) | 2025-02-13 | Project infrastructure setup |
+
+---
+
+## Change Categories
+
+| Category | Prefix | Description |
+|:---------|:-------|:------------|
+| Features | `feat:` | New functionality |
+| Fixes | `fix:` | Bug fixes |
+| Refactoring | `refactor:` | Code improvements |
+| Documentation | `docs:` | Documentation updates |
+| Tests | `test:` | Test additions/improvements |
+| Chores | `chore:` | Build, CI, tooling |
+| Performance | `perf:` | Performance improvements |
+| Security | `security:` | Security-related changes |
+
+---
+
+## Versioning
+
+This project follows [Semantic Versioning](https://semver.org/):
+
+- **MAJOR** — Incompatible API changes
+- **MINOR** — Backward-compatible new features
+- **PATCH** — Backward-compatible bug fixes
+
+---
+
+## Latest Highlights
+
+### v1.0.0 (Current)
+
+- ✅ Production-ready WebRTC learning platform
+- ✅ Multi-party Mesh architecture (up to 50 participants)
+- ✅ Bilingual documentation (English & 简体中文)
+- ✅ Complete API reference and troubleshooting guides
+- ✅ Docker deployment with HTTPS/TURN support
+- ✅ Comprehensive test coverage (Go + JavaScript)
+
+---
+
+**Full Changelog**: [`changelog/`](changelog/)
+
+**Archived Logs**: [`changelog/archive/`](changelog/archive/) (legacy format)