Fix SMART data and site latency checking issues

- Add sudo to disk collector smartctl commands for proper SMART data access
- Add reqwest dependency with blocking feature for HTTP site checks
- Replace curl-based site latency with reqwest HTTP client implementation
- Maintain 2-second connect timeout and 5-second total timeout
- Fix disk health UNKNOWN status by enabling proper SMART permissions
- Fix nginx site timeout issues by using proper HTTP client with redirect support

agent/src/collectors/disk.rs

@@ -176,7 +176,8 @@ impl DiskCollector {
 
     /// Get SMART health for a specific physical device
     fn get_smart_health(&self, device: &str) -> (String, f32) {
-        if let Ok(output) = Command::new("smartctl")
+        if let Ok(output) = Command::new("sudo")
+            .arg("smartctl")
             .arg("-H")
             .arg(device)
             .output() 
@@ -192,7 +193,8 @@ impl DiskCollector {
                 };
 
                 // Try to get temperature
-                let temperature = if let Ok(temp_output) = Command::new("smartctl")
+                let temperature = if let Ok(temp_output) = Command::new("sudo")
+                    .arg("smartctl")
                     .arg("-A")
                     .arg(device)
                     .output()