fix windows build.

Gate Linux-specific imports and fields to avoid Windows dead-code/unused warnings.
Ensure Linux-only proc CPU tracker is not referenced on non-Linux builds.

socktop_agent/src/metrics.rs

@@ -4,6 +4,7 @@ use crate::gpu::collect_all_gpus;
 use crate::state::AppState;
 use crate::types::{DiskInfo, Metrics, NetworkInfo, ProcessInfo, ProcessesPayload};
 use once_cell::sync::OnceCell;
+#[cfg(target_os = "linux")]
 use std::collections::HashMap;
 #[cfg(target_os = "linux")]
 use std::fs;
@@ -260,12 +261,20 @@ pub async fn collect_processes_top_k(state: &AppState, k: usize) -> ProcessesPay
 
     // Compute deltas vs last sample
     let (last_total, mut last_map) = {
-        let mut t = state.proc_cpu.lock().await;
-        let lt = t.last_total;
-        let lm = std::mem::take(&mut t.last_per_pid);
-        t.last_total = total_now;
-        t.last_per_pid = current.clone();
-        (lt, lm)
+        #[cfg(target_os = "linux")]
+        {
+            let mut t = state.proc_cpu.lock().await;
+            let lt = t.last_total;
+            let lm = std::mem::take(&mut t.last_per_pid);
+            t.last_total = total_now;
+            t.last_per_pid = current.clone();
+            (lt, lm)
+        }
+        #[cfg(not(target_os = "linux"))]
+        {
+            let _: u64 = total_now; // silence unused warning
+            (0u64, HashMap::new())
+        }
     };
 
     // On first run or if total delta is tiny, report zeros

socktop_agent/src/state.rs

@@ -1,5 +1,6 @@
 //! Shared agent state: sysinfo handles and hot JSON cache.
 
+#[cfg(target_os = "linux")]
 use std::collections::HashMap;
 use std::sync::atomic::AtomicUsize;
 use std::sync::Arc;
@@ -11,6 +12,7 @@ pub type SharedComponents = Arc<Mutex<Components>>;
 pub type SharedDisks = Arc<Mutex<Disks>>;
 pub type SharedNetworks = Arc<Mutex<Networks>>;
 
+#[cfg(target_os = "linux")]
 #[derive(Default)]
 pub struct ProcCpuTracker {
     pub last_total: u64,
@@ -25,6 +27,7 @@ pub struct AppState {
     pub networks: SharedNetworks,
 
     // For correct per-process CPU% using /proc deltas (Linux only path uses this tracker)
+    #[cfg(target_os = "linux")]
     pub proc_cpu: Arc<Mutex<ProcCpuTracker>>,
 
     // Connection tracking (to allow future idle sleeps if desired)
@@ -45,6 +48,7 @@ impl AppState {
             components: Arc::new(Mutex::new(components)),
             disks: Arc::new(Mutex::new(disks)),
             networks: Arc::new(Mutex::new(networks)),
+            #[cfg(target_os = "linux")]
             proc_cpu: Arc::new(Mutex::new(ProcCpuTracker::default())),
             client_count: Arc::new(AtomicUsize::new(0)),
             auth_token: std::env::var("SOCKTOP_TOKEN")