style: apply rustfmt to backend codebase

- Apply rustfmt to all Rust source files in backend/
- Fix trailing whitespace inconsistencies
- Standardize formatting across handlers, models, and services
- Improve code readability with consistent formatting

These changes are purely stylistic and do not affect functionality.
All CI checks now pass with proper formatting.

backend/src/security/account_lockout.rs

@@ -1,8 +1,8 @@
+use anyhow::Result;
 use mongodb::bson::{doc, DateTime};
 use mongodb::Collection;
 use std::sync::Arc;
 use tokio::sync::RwLock;
-use anyhow::Result;
 
 #[derive(Clone)]
 pub struct AccountLockout {
@@ -26,16 +26,11 @@ impl AccountLockout {
             max_duration_minutes,
         }
     }
-    
+
     pub async fn check_lockout(&self, email: &str) -> Result<bool> {
         let collection = self.user_collection.read().await;
-        let user = collection
-            .find_one(
-                doc! { "email": email },
-                None,
-            )
-            .await?;
-        
+        let user = collection.find_one(doc! { "email": email }, None).await?;
+
         if let Some(user_doc) = user {
             if let Some(locked_until_val) = user_doc.get("locked_until") {
                 if let Some(dt) = locked_until_val.as_datetime() {
@@ -46,32 +41,28 @@ impl AccountLockout {
                 }
             }
         }
-        
+
         Ok(false) // Account is not locked
     }
-    
+
     pub async fn record_failed_attempt(&self, email: &str) -> Result<bool> {
         let collection = self.user_collection.write().await;
-        
+
         // Get current failed attempts
-        let user = collection
-            .find_one(
-                doc! { "email": email },
-                None,
-            )
-            .await?;
-        
+        let user = collection.find_one(doc! { "email": email }, None).await?;
+
         let current_attempts = if let Some(user_doc) = user {
-            user_doc.get("failed_login_attempts")
+            user_doc
+                .get("failed_login_attempts")
                 .and_then(|v| v.as_i64())
                 .unwrap_or(0) as u32
         } else {
             0
         };
-        
+
         let new_attempts = current_attempts + 1;
         let should_lock = new_attempts >= self.max_attempts;
-        
+
         // Calculate lockout duration
         let lock_duration = if should_lock {
             let multiplier = (new_attempts as u32).saturating_sub(self.max_attempts) + 1;
@@ -80,7 +71,7 @@ impl AccountLockout {
         } else {
             0
         };
-        
+
         let locked_until = if lock_duration > 0 {
             let now = DateTime::now();
             let duration_millis = lock_duration as u64 * 60 * 1000;
@@ -88,7 +79,7 @@ impl AccountLockout {
         } else {
             DateTime::now()
         };
-        
+
         // Update user
         collection
             .update_one(
@@ -103,13 +94,13 @@ impl AccountLockout {
                 None,
             )
             .await?;
-        
+
         Ok(should_lock)
     }
-    
+
     pub async fn reset_attempts(&self, email: &str) -> Result<()> {
         let collection = self.user_collection.write().await;
-        
+
         collection
             .update_one(
                 doc! { "email": email },
@@ -122,7 +113,7 @@ impl AccountLockout {
                 None,
             )
             .await?;
-        
+
         Ok(())
     }
 }