[nightshift] code-quality: automated improvements

[nightshift-micr]

Automated by Nightshift v3 (GLM 5.1).

Task: Code Quality Fixes
Category: pr
Model: GLM 5.1

Changes

Fixed 12 clippy warnings across 10 source files:

Idiomatic Rust fixes

• collapsible_if (7 fixes): Collapsed nested if-if let chains into single combined conditions using let-chains in yara.rs, scan.rs, verdict.rs
• unnecessary_sort_by: Replaced sort_by(|a, b| key(a).cmp(&key(b))) with idiomatic sort_by_key in detectors/mod.rs
• useless_conversion: Removed unnecessary .into_iter() in capability_base64_stager.rs
• if_same_then_else: Merged duplicate if branches in capability_network.rs
• needless_lifetimes: Removed explicit lifetime annotations in profile.rs
• question_mark: Replaced explicit if is_none() { return None } guard with ? in main.rs

Documentation

• Added doc comments to 7 public structs in lib.rs and malwarebazaar.rs

Verification

• cargo check passes cleanly
• cargo clippy passes with zero warnings

Merge if useful, close if not.