docs(README): 更新项目列表

- 添加了多个项目的链接和简要说明，包括：
  - civitai_api
  - proxyfrpc
  - app_store_connect_api
  - ievent_bus
  - pubupgrade
  - notify_toast
- 优化了 README 的结构，使用了标题格式

Author: iptodays

README.md

@@ -1 +1,11 @@
-# packages
+### [civitai_api](./civitai_api/README.md)
+
+### [proxyfrpc](./proxyfrpc/README.md)
+
+### [app_store_connect_api](./app_store_connect_api/README.md)
+
+### [ievent_bus](./ievent_bus/README.md)
+
+### [pubupgrade](./pubupgrade/README.md)
+
+### [notify_toast](./notify_toast/README.md)