fix(enterprise): resolve clippy warnings in license commands

- Use if-let chains with && syntax for collapsible if statements
- Replace manual range checks with RangeInclusive::contains()
- Ensures clean CI pipeline for PR #308

Author: joshrotenberg

crates/redisctl/src/commands/enterprise/license.rs

@@ -330,19 +330,19 @@ async fn handle_license_usage(
 
 // Helper functions
 pub fn calculate_days_remaining(expiration_date: Option<&str>) -> i64 {
-    if let Some(date_str) = expiration_date {
-        if let Ok(exp_date) = chrono::NaiveDate::parse_from_str(date_str, "%Y-%m-%d") {
-            let today = chrono::Local::now().naive_local().date();
-            let duration = exp_date.signed_duration_since(today);
-            return duration.num_days();
-        }
+    if let Some(date_str) = expiration_date
+        && let Ok(exp_date) = chrono::NaiveDate::parse_from_str(date_str, "%Y-%m-%d")
+    {
+        let today = chrono::Local::now().naive_local().date();
+        let duration = exp_date.signed_duration_since(today);
+        return duration.num_days();
     }
     -1
 }
 
 pub fn should_warn_expiry(expiration_date: Option<&str>) -> bool {
     let days = calculate_days_remaining(expiration_date);
-    days >= 0 && days <= 30
+    (0..=30).contains(&days)
 }
 
 pub fn calculate_available(limit: Option<i64>, used: Option<i64>) -> i64 {

crates/redisctl/src/commands/enterprise/license_workflow.rs

@@ -116,7 +116,7 @@ async fn handle_license_audit(
                             .unwrap_or("unknown");
                         let days_remaining =
                             super::license::calculate_days_remaining(Some(expiration_date));
-                        let is_expiring = days_remaining >= 0 && days_remaining <= 30;
+                        let is_expiring = (0..=30).contains(&days_remaining);
 
                         // Apply filters
                         if expired_only && !expired {