feat: 绑定自定义域名 capa.rxcloud.group

- 更新 baseURL 为 https://capa.rxcloud.group/
- 添加 static/CNAME 确保部署时保留域名配置

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: kevinten10

config.toml

@@ -1,7 +1,7 @@
 title = "Capa"
 
 # copy from github pages
-baseURL = "https://capa-cloud.github.io/capa.io/"
+baseURL = "https://capa.rxcloud.group/"
 
 # use '/docs' github pages mode
 publishDir = "docs"

static/CNAME

@@ -0,0 +1 @@
+capa.rxcloud.group