feat: add direct WireGuard metrics collection on Windows with service status check and wg show dump parsing

Add direct_windows_metrics function that queries WireGuard tunnel metrics directly using sc query and wg show dump commands instead of tunnel helper. Add find_windows_wg helper to locate wg.exe in standard installation paths. Update metrics function to attempt direct collection first on Windows before falling back to tunnel helper. Parse rx_bytes and tx_bytes from wg show dump output by sum

desktop-client/src-tauri/src/tunnel_manager.rs

@@ -61,6 +61,13 @@ pub fn is_active(app: &AppHandle, profile_path: &Path) -> Result<bool, String> {
 }
 
 pub fn metrics(app: &AppHandle, profile_path: &Path) -> Result<TunnelMetrics, String> {
+    #[cfg(target_os = "windows")]
+    {
+        if let Ok(metrics) = direct_windows_metrics(profile_path) {
+            return Ok(metrics);
+        }
+    }
+
     let backend = bundled_backend(app)?;
     let mut command = Command::new(backend);
     command.arg("metrics").arg("--profile").arg(profile_path);
@@ -86,6 +93,89 @@ pub struct TunnelMetrics {
     pub tx_bytes: u64,
 }
 
+#[cfg(target_os = "windows")]
+fn direct_windows_metrics(profile_path: &Path) -> Result<TunnelMetrics, String> {
+    let tunnel_name = profile_path
+        .file_stem()
+        .and_then(|value| value.to_str())
+        .ok_or_else(|| "invalid profile filename".to_string())?;
+    let service_name = format!("WireGuardTunnel${}", tunnel_name);
+
+    let mut status_cmd = Command::new("sc");
+    status_cmd.arg("query").arg(&service_name).creation_flags(CREATE_NO_WINDOW);
+    let status_output = status_cmd
+        .output()
+        .map_err(|err| format!("Unable to query tunnel status: {err}"))?;
+
+    if !status_output.status.success() {
+        return Ok(TunnelMetrics {
+            active: false,
+            rx_bytes: 0,
+            tx_bytes: 0,
+        });
+    }
+
+    let status_stdout = String::from_utf8_lossy(&status_output.stdout);
+    if !status_stdout.contains("RUNNING") {
+        return Ok(TunnelMetrics {
+            active: false,
+            rx_bytes: 0,
+            tx_bytes: 0,
+        });
+    }
+
+    let wg = find_windows_wg()?;
+    let mut wg_cmd = Command::new(wg);
+    wg_cmd
+        .arg("show")
+        .arg(tunnel_name)
+        .arg("dump")
+        .creation_flags(CREATE_NO_WINDOW);
+    let wg_output = wg_cmd
+        .output()
+        .map_err(|err| format!("Unable to query WireGuard counters: {err}"))?;
+
+    if !wg_output.status.success() {
+        return Ok(TunnelMetrics {
+            active: true,
+            rx_bytes: 0,
+            tx_bytes: 0,
+        });
+    }
+
+    let stdout = String::from_utf8_lossy(&wg_output.stdout);
+    let mut rx_bytes = 0_u64;
+    let mut tx_bytes = 0_u64;
+
+    for line in stdout.lines().skip(1) {
+        let fields: Vec<&str> = line.split('\t').collect();
+        if fields.len() < 7 {
+            continue;
+        }
+        rx_bytes = rx_bytes.saturating_add(fields[5].parse::<u64>().unwrap_or(0));
+        tx_bytes = tx_bytes.saturating_add(fields[6].parse::<u64>().unwrap_or(0));
+    }
+
+    Ok(TunnelMetrics {
+        active: true,
+        rx_bytes,
+        tx_bytes,
+    })
+}
+
+#[cfg(target_os = "windows")]
+fn find_windows_wg() -> Result<PathBuf, String> {
+    let candidates = [
+        PathBuf::from(r"C:\Program Files\WireGuard\wg.exe"),
+        PathBuf::from(r"C:\Program Files (x86)\WireGuard\wg.exe"),
+    ];
+
+    candidates
+        .into_iter()
+        .find(|path| path.exists())
+        .ok_or_else(|| "required Windows WireGuard CLI is not available".to_string())
+}
+
 fn bundled_backend(app: &AppHandle) -> Result<PathBuf, String> {
     let resource_dir = app
         .path()