fix: capture tokio runtime handle for config reload callback

[yinheli]

No description provided.

[Copilot]

Pull request overview

This PR fixes a runtime panic that occurred when the file watcher callback tried to call tokio::runtime::Handle::current() from outside a Tokio runtime context. The fix captures the runtime handle when inside the async runtime context and passes it to the reload functions.

Changes:

• Moved config watcher initialization into the Tokio runtime's async context
• Created start_watch function to capture runtime handle and initialize the file watcher
• Updated watch, reload_hosts, and reload_rules functions to accept and use the captured runtime handle

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/main.rs	Moved start_watch call into rt.block_on async block to ensure it runs within runtime context
src/config/mod.rs	Exported new start_watch function
src/config/load.rs	Added start_watch function to capture runtime handle; updated internal functions to accept and use the captured handle instead of calling Handle::current() in callbacks

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.

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