chore: use mimalloc

[suxin2017]

No description provided.

[Copilot]

Pull Request Overview

This PR introduces mimalloc as the global memory allocator for the lynx-cli application and updates the project version to 0.4.9-alpha.3. The change aims to potentially improve memory allocation performance by replacing the default system allocator.

• Adds mimalloc as a global allocator in the CLI application
• Updates project version from 0.4.8 to 0.4.9-alpha.3
• Adds mimalloc dependency to the lynx-cli crate

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
crates/lynx-cli/src/main.rs	Configures mimalloc as the global allocator
crates/lynx-cli/Cargo.toml	Adds mimalloc dependency and updates lynx-core version
Cargo.toml	Updates workspace version to 0.4.9-alpha.3

Comments suppressed due to low confidence (1)

crates/lynx-cli/Cargo.toml:37

• The version "0.1" for mimalloc does not exist. The correct version should be "0.1.43" or a similar valid version. Please update to a valid mimalloc version.

mimalloc = { version = "0.1" }