refactor: extract listener-core as standalone crate

[yujonglee]

Summary

• Moves all actor logic (listener, recorder, session, source) out of the plugins/listener Tauri plugin into a new platform-agnostic crates/listener-core crate
• The Tauri plugin now depends on listener-core rather than owning the implementation
• Adds a cli example in listener-core for testing the core logic without Tauri

Motivation

Decoupling the core listener logic from the Tauri plugin layer makes it easier to test, reuse, and develop independently of the desktop app runtime.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.

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[cursor]

Early return from ? aborts directory search prematurely

Low Severity

In find_session_dir_recursive, the ? operator on path.file_name()?.to_str()? inside the for loop will short-circuit and return None from the entire function if any directory entry has a non-UTF-8 name, rather than just skipping that entry. This causes the search to abort prematurely, and the caller falls back to the default path, potentially missing the real session directory. Using a let-else with continue would correctly skip the problematic entry.