fix/format: cargo fmt failed to resolve mod inner

[YuevUwU]

RESOLVES #630
You can view the details there

This PR includes:

• Add #[rustfmt::skip] to mod inner to resolve the error and interrupted formatting
• Format whole project using cargo fmt
  • with rustfmt 1.8.0-stable (ded5c06cf2 2025-12-08)

Key Implementation

#[rustfmt::skip]
#[cfg(feature = "closed")]
pub mod inner;

Whether to remove the ignore option from rustfmt.toml depends on the developer's original intent when adding it.