fix(resp):优化整数解析逻辑

- 修改字节到数字的转换方式，使用位运算替代字符减法
- 提高数字解析效率，减少不必要的类型转换
-保持解析逻辑的一致性，确保数据正确性

Author: smthing

src/main/java/tech/smartboot/redisun/resp/Integers.java

@@ -54,7 +54,7 @@ public static Integers of(ByteBuffer readBuffer) {
             byte b = readBuffer.get(readBuffer.position());
             if (b >= '0' && b <= '9') {
                 readBuffer.position(readBuffer.position() + 3);
-                return ZERO_TO_NINES[b - '0'];
+                return ZERO_TO_NINES[b & 0x0F];
             }
         }
         return new Integers();

src/main/java/tech/smartboot/redisun/resp/RESP.java

@@ -111,7 +111,7 @@ protected int readInt(ByteBuffer readBuffer) {
         while (readBuffer.hasRemaining()) {
             byte b = readBuffer.get();
             if (b >= '0' && b <= '9') {
-                v = v * 10 + b - '0';
+                v = v * 10 + (b & 0x0f);
                 continue;
             } else if (readBuffer.remaining() < 1) {//非完整包，正常退出
                 readBuffer.reset();