Refactor KeyPairMapper to improve query readability by aliasing fields and reformatting SQL.

database/src/main/java/com/alttd/altitudeweb/database/web_db/KeyPairMapper.java

@@ -4,7 +4,12 @@ import org.apache.ibatis.annotations.*;
 
 public interface KeyPairMapper {
     
-    @Select("SELECT * FROM key_pair ORDER BY id DESC LIMIT 1")
+    @Select("""
+            SELECT id, private_key AS privateKey, public_key AS publicKey, created_at AS createdAt
+            FROM key_pair
+            ORDER BY id
+                DESC LIMIT 1
+            """)
     KeyPairEntity getKeyPair();
     
     @Insert("""