fix(windows): add Win32_Security feature + 2024 edition unsafe wrappers

- CreateEventW is gated behind Win32_Security in the windows crate
  because its signature takes SECURITY_ATTRIBUTES; add to features.
- Remove unused HANDLE import.
- Wrap GetId() and PWSTR::to_string() in explicit unsafe { ... }
  blocks for Rust 2024 edition's unsafe_op_in_unsafe_fn lint.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

crates/wzp-client/Cargo.toml

@@ -40,6 +40,7 @@ coreaudio-rs = { version = "0.11", optional = true }
 windows = { version = "0.58", optional = true, features = [
     "Win32_Foundation",
     "Win32_Media_Audio",
+    "Win32_Security",
     "Win32_System_Com",
     "Win32_System_Com_StructuredStorage",
     "Win32_System_Threading",