feat(store): introduce GitTokenStore for token persistence via Git backend

- Added `GitTokenStore` to handle token storage and metadata using Git as a backing storage.
- Implemented methods for initialization, save, retrieval, listing, and deletion of auth files.
- Updated `go.mod` and `go.sum` to include new dependencies for Git integration.
- Integrated support for Git-backed configuration via `GitTokenStore`.
- Updated server logic to clone, initialize, and manage configurations from Git repositories.
- Added helper functions for verifying and synchronizing configuration files.
- Improved error handling and contextual logging for Git operations.
- Modified Dockerfile to include `config.example.yaml` for initial setup.
- Added `gitCommitter` interface to handle Git-based commit and push operations.
- Configured `Watcher` to detect and leverage Git-backed token stores.
- Implemented `commitConfigAsync` and `commitAuthAsync` methods for asynchronous change synchronization.
- Enhanced `GitTokenStore` with `CommitPaths` method to support selective file commits.

docker-compose.yml

@@ -22,5 +22,4 @@ services:
       - ./config.yaml:/CLIProxyAPI/config.yaml
       - ./auths:/root/.cli-proxy-api
       - ./logs:/CLIProxyAPI/logs
-      - ./conv:/CLIProxyAPI/conv
     restart: unless-stopped