style: apply cargo fmt to entire codebase

Standardize code formatting across all 173 Rust source files
using rustfmt. No functional changes - purely cosmetic.

This establishes a consistent code style baseline for the
project going forward.

src/application/dtos/folder_dto.rs

@@ -1,12 +1,12 @@
-use serde::{Serialize, Deserialize};
 use crate::domain::entities::folder::Folder;
+use serde::{Deserialize, Serialize};
 
 /// DTO for folder creation requests
 #[derive(Debug, Deserialize)]
 pub struct CreateFolderDto {
     /// Name of the folder to create
     pub name: String,
-    
+
     /// Parent folder ID (None for root level)
     pub parent_id: Option<String>,
 }
@@ -30,22 +30,22 @@ pub struct MoveFolderDto {
 pub struct FolderDto {
     /// Folder ID
     pub id: String,
-    
+
     /// Folder name
     pub name: String,
-    
+
     /// Path to the folder (relative)
     pub path: String,
-    
+
     /// Parent folder ID
     pub parent_id: Option<String>,
-    
+
     /// Creation timestamp
     pub created_at: u64,
-    
+
     /// Last modification timestamp
     pub modified_at: u64,
-    
+
     /// Whether this is a root folder
     pub is_root: bool,
 }
@@ -53,7 +53,7 @@ pub struct FolderDto {
 impl From<Folder> for FolderDto {
     fn from(folder: Folder) -> Self {
         let is_root = folder.parent_id().is_none();
-        
+
         Self {
             id: folder.id().to_string(),
             name: folder.name().to_string(),
@@ -77,7 +77,7 @@ impl From<FolderDto> for Folder {
             dto.path,
             dto.parent_id,
             dto.created_at,
-            dto.modified_at
+            dto.modified_at,
         )
     }
 }
@@ -101,4 +101,4 @@ impl Default for FolderDto {
     fn default() -> Self {
         Self::empty()
     }
-}
+}