fix: build errors in ostp-guard, ostp-daemon, ostp-installer

- Make check_analysis_tools() public in ostp-guard
- Fix PWSTR type in ostp-installer (use windows::core::PWSTR)
- Remove unused imports (Context, Foundation, fileapi, minwindef)

Build artifacts in dist/:
- Linux x64: ostp-server (9.2 MB), oncp-master (4.8 MB)
- Windows x64: ostp-client.exe (1.64 MB), ostp-daemon.exe (0.53 MB), ostp-installer.exe (0.37 MB)

ostp-guard/src/anti_vm.rs

@@ -24,7 +24,7 @@ pub fn is_virtual_machine() -> bool {
 }
 
 /// HIGH: Check for reverse engineering tools in memory
-fn check_analysis_tools() -> bool {
+pub fn check_analysis_tools() -> bool {
     #[cfg(unix)]
     {
         if let Ok(output) = std::process::Command::new("ps")