fix: byte、short 位运算转为 int 的问题

src/main/java/org/jcnc/snow/vm/commands/bitwise/byte8/BAndCommand.java

@@ -49,7 +49,7 @@ public class BAndCommand implements Command {
         final byte a = (byte) operandStack.pop();
 
         // Perform the byte8 bitwise AND operation and push the result back onto the stack
-        operandStack.push(a & b);
+        operandStack.push((byte)(a & b));
 
         return currentPC + 1;
     }

src/main/java/org/jcnc/snow/vm/commands/bitwise/byte8/BOrCommand.java

@@ -49,7 +49,7 @@ public class BOrCommand implements Command {
         final byte a = (byte) operandStack.pop();
 
         // Perform the byte8 bitwise OR operation and push the result back onto the stack
-        operandStack.push(a | b);
+        operandStack.push((byte)(a | b));
 
         return currentPC + 1;
     }

src/main/java/org/jcnc/snow/vm/commands/bitwise/byte8/BXorCommand.java

@@ -49,7 +49,7 @@ public class BXorCommand implements Command {
         final byte a = (byte) operandStack.pop();
 
         // Perform the byte8 bitwise XOR operation and push the result back onto the stack
-        operandStack.push(a ^ b);
+        operandStack.push((byte)(a ^ b));
 
         return currentPC + 1;
     }

src/main/java/org/jcnc/snow/vm/commands/bitwise/short16/SAndCommand.java

@@ -49,7 +49,7 @@ public class SAndCommand implements Command {
         final short a = (short) operandStack.pop();
 
         // Perform the short16 bitwise AND operation and push the result back onto the stack
-        operandStack.push(a & b);
+        operandStack.push((short)(a & b));
 
         return currentPC + 1;
     }

src/main/java/org/jcnc/snow/vm/commands/bitwise/short16/SOrCommand.java

@@ -49,7 +49,7 @@ public class SOrCommand implements Command {
         final short a = (short) operandStack.pop();
 
         // Perform the short16 bitwise OR operation and push the result back onto the stack
-        operandStack.push(a | b);
+        operandStack.push((short)(a | b));
 
         return currentPC + 1;
     }

src/main/java/org/jcnc/snow/vm/commands/bitwise/short16/SXorCommand.java

@@ -49,7 +49,7 @@ public class SXorCommand implements Command {
         final short a = (short) operandStack.pop();
 
         // Perform the short16 bitwise XOR operation and push the result back onto the stack
-        operandStack.push(a ^ b);
+        operandStack.push((short)(a ^ b));
 
         return currentPC + 1;
     }