feat: add many things

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/forage-core/src/auth/mod.rs

@@ -20,6 +20,14 @@ pub struct User {
     pub emails: Vec<UserEmail>,
 }
 
+/// Public user profile (no emails).
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct UserProfile {
+    pub user_id: String,
+    pub username: String,
+    pub created_at: Option<String>,
+}
+
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct UserEmail {
     pub email: String,
@@ -91,6 +99,12 @@ pub trait ForestAuth: Send + Sync {
 
     async fn get_user(&self, access_token: &str) -> Result<User, AuthError>;
 
+    async fn get_user_by_username(
+        &self,
+        access_token: &str,
+        username: &str,
+    ) -> Result<UserProfile, AuthError>;
+
     async fn list_tokens(
         &self,
         access_token: &str,