fix: resolve clippy warnings

Reduce clippy warnings from54 to16 by fixing mechanical issues:

- collapsible_if: collapse nested if-let chains with let-chains
- clone_on_copy: remove unnecessary .clone() on Copy types
- manual_clamp: replace .max().min() with .clamp()
- unnecessary_cast: remove redundant type casts
- collapsible_else_if: flatten else-if chains
- contains_vs_iter_any: replace .iter().any() with .contains()
- unnecessary_closure: replace .or_else(|| x) with .or(x)
- useless_conversion: remove redundant .into() calls
- is_none_or: replace .map_or(true, ...) with .is_none_or(...)
- while_let_loop: convert loop with if-let-break to while-let

Remaining16 warnings are design-level issues (too_many_arguments,
await_holding_lock, type_complexity, new_ret_no_self) that require
architectural changes to fix.

src/util/time.rs

@@ -67,15 +67,15 @@ pub async fn check_time_sync() -> Option<TimeSyncResult> {
 #[allow(dead_code)]
 pub async fn time_sync_task(check_interval: Duration) -> ! {
     loop {
-        if let Some(result) = check_time_sync().await {
-            if result.is_skewed {
-                error!(
-                    "System clock is off by {} seconds. Please sync your clock.",
-                    result.skew_secs
-                );
-            }
+        if let Some(result) = check_time_sync().await
+            && result.is_skewed
+        {
+            error!(
+                "System clock is off by {} seconds. Please sync your clock.",
+                result.skew_secs
+            );
         }
-        
+
         tokio::time::sleep(check_interval).await;
     }
 }