chore(release): 升级版本号至 v0.2.0 正式版;

- 版本号从 0.2.0a2 升级至 0.2.0 正式发布版
- pyproject.toml 与 uv.lock 同步更新

🤖 Generated with [Claude Code](https://github.com/claude)
Co-Authored-By: Aurelius Huang<threefish.ai@gmail.com>

Author: ThreeFish-AI

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "coding-proxy"
-version = "0.2.0a2"
+version = "0.2.0"
 description = "A High-Availability, Transparent, and Smart Multi-Vendor Proxy for Claude Code. Support Claude Plans, GitHub Copilot, Google Antigravity, ZAI/GLM."
 readme = "README.md"
 requires-python = ">=3.12"