style: format seluruh workspace dengan cargo fmt

Menyeragamkan format kode sesuai rustfmt (126 file). Sebelumnya
lefthook pre-commit 'cargo fmt --check' akan gagal pada commit apa pun.

apps/interfaces/api/src/handlers/auth.rs

@@ -105,7 +105,9 @@ pub async fn login_handler(
         serde_json::from_str(&content)
             .map_err(|e| ApiError::Internal(format!("Failed to parse users: {e}")))?
     } else {
-        return Err(ApiError::Unauthorized("Invalid username or password".into()));
+        return Err(ApiError::Unauthorized(
+            "Invalid username or password".into(),
+        ));
     };
 
     // Look up the user
@@ -121,7 +123,9 @@ pub async fn login_handler(
         .map_err(|e| ApiError::Internal(format!("Password verification failed: {e}")))?;
 
     if !valid {
-        return Err(ApiError::Unauthorized("Invalid username or password".into()));
+        return Err(ApiError::Unauthorized(
+            "Invalid username or password".into(),
+        ));
     }
 
     // Generate tokens
@@ -205,9 +209,7 @@ pub async fn register_handler(
 
     // Check uniqueness
     if users.contains_key(&req.username) {
-        return Err(ApiError::Conflict(
-            "Username already exists".into(),
-        ));
+        return Err(ApiError::Conflict("Username already exists".into()));
     }
 
     // Persist

apps/interfaces/api/src/handlers/chat.rs

@@ -136,7 +136,8 @@ pub async fn chat_completions_handler(
             None, // No tool definitions for basic chat
             req.max_tokens,
             req.temperature,
-        ).await
+        )
+        .await
         .map_err(|e| ApiError::ChatProxy(format!("LLM request failed: {e}")))?;
 
     let (prompt_tokens, completion_tokens) = usage.unwrap_or((0, 0));

apps/interfaces/api/src/handlers/sessions.rs

@@ -91,8 +91,8 @@ pub async fn delete_session_handler(
         return Err(ApiError::BadRequest("Session ID is required".into()));
     }
 
-    let session_id =
-        SessionId::new(&id).map_err(|e| ApiError::BadRequest(format!("Invalid session ID: {e}")))?;
+    let session_id = SessionId::new(&id)
+        .map_err(|e| ApiError::BadRequest(format!("Invalid session ID: {e}")))?;
 
     state.session_service.archive_session(session_id)?;