fix(windows): Revert to correct Win32::UI::Shell::IsUserAnAdmin import

The previous commit incorrectly changed the import path to
Win32::Security::Authorization::IsUserAnAdmin, which doesn't exist.

The correct import is Win32::UI::Shell::IsUserAnAdmin as documented at:
https://microsoft.github.io/windows-docs-rs/doc/windows/Win32/UI/Shell/fn.IsUserAnAdmin.html

Changes:
- crates/prtip-network/src/privilege.rs: Restored Win32::UI::Shell import
- Cargo.toml: Removed unnecessary Win32_Security_Authorization feature

This fixes the Windows build failure in GitHub Actions CI.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: doublegate

Cargo.toml

@@ -60,7 +60,7 @@ indicatif = "0.17"
 # Platform-specific (shared definitions)
 nix = { version = "0.27", features = ["user", "process"] }
 libc = "0.2"
-windows = { version = "0.52", features = ["Win32_Security", "Win32_Security_Authorization", "Win32_Foundation", "Win32_NetworkManagement_IpHelper", "Win32_UI_Shell"] }
+windows = { version = "0.52", features = ["Win32_Security", "Win32_Foundation", "Win32_NetworkManagement_IpHelper", "Win32_UI_Shell"] }
 
 [workspace.package]
 version = "0.3.0"

crates/prtip-network/src/privilege.rs

@@ -158,7 +158,7 @@ fn unix_drop_privileges(user: &str, group: &str) -> Result<()> {
 #[cfg(target_os = "windows")]
 fn windows_has_capability() -> Result<bool> {
     use windows::Win32::Foundation::BOOL;
-    use windows::Win32::Security::Authorization::IsUserAnAdmin;
+    use windows::Win32::UI::Shell::IsUserAnAdmin;
 
     unsafe {
         let is_admin: BOOL = IsUserAnAdmin();