Refactor user account management by replacing User entity with UserAccount, updating UserController and UserService for CRUD operations, and modifying MyBatis mappers accordingly.

src/main/java/com/gameplatform/server/security/JwtService.java

@@ -2,7 +2,7 @@ package com.gameplatform.server.security;
 
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.SignatureAlgorithm;
-import io.jsonwebtoken.io.Decoders;
+
 import io.jsonwebtoken.security.Keys;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

src/main/java/com/gameplatform/server/security/SecurityConfig.java

@@ -3,7 +3,7 @@ package com.gameplatform.server.security;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 import org.springframework.http.HttpMethod;
-import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+
 import org.springframework.security.config.annotation.web.reactive.EnableWebFluxSecurity;
 import org.springframework.security.config.web.server.ServerHttpSecurity;
 import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;