refactor: refactoring code; update encryption algorithm; add build ci;

src/main/java/xin/merlin/myblog_server/utils/SHA256Util.java

@@ -45,12 +45,9 @@ public class SHA256Util {
      * @param password 用户输入的密码
      * @return 加密后的密码哈希值
      */
-    @Value("${jwt.salt}")
-    private String salt;
 
     public String encryptPassword(String password) {
-        String s = encryptSHA256(salt);
         // 将盐值与密码拼接后进行SHA-256加密
-        return encryptSHA256(s +s + password + s);
+        return encryptSHA256( password);
     }
 }