feat: Add user domain model

domain/src/lib.rs

@@ -1,2 +1,3 @@
 pub mod db;
 pub mod repository;
+pub mod user;

domain/src/user/mod.rs

@@ -0,0 +1 @@
+pub mod model;

domain/src/user/model.rs

@@ -0,0 +1,45 @@
+use chrono::{DateTime, Utc};
+use serde::{Deserialize, Serialize};
+use uuid::Uuid;
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct User {
+    pub id: Uuid,
+    pub username: String,
+    pub email: String,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct CreateUserDto {
+    pub username: String,
+    pub email: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct UpdateUserDto {
+    pub username: Option<String>,
+    pub email: Option<String>,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct UserDto {
+    pub id: Uuid,
+    pub username: String,
+    pub email: String,
+    pub created_at: DateTime<Utc>,
+    pub updated_at: DateTime<Utc>,
+}
+
+impl From<User> for UserDto {
+    fn from(user: User) -> Self {
+        Self {
+            id: user.id,
+            username: user.username,
+            email: user.email,
+            created_at: user.created_at,
+            updated_at: user.updated_at,
+        }
+    }
+}