fix: force UTF-8 output for PowerShell code_run

ga.py

@@ -28,7 +28,8 @@ def code_run(code, code_type="python", timeout=60, cwd=None, code_cwd=None, stop
     elif code_type in ["powershell", "bash", "sh", "shell", "ps1", "pwsh"]:
         if os.name == 'nt':
             _ps = "pwsh" if shutil.which("pwsh") else "powershell"
-            cmd = [_ps, "-NoProfile", "-NonInteractive", "-Command", code]
+            utf8_prefix = "[Console]::OutputEncoding = [System.Text.Encoding]::UTF8; "
+            cmd = [_ps, "-NoProfile", "-NonInteractive", "-Command", utf8_prefix + code]
         else: cmd = ["bash", "-c", code]
     else:
         return {"status": "error", "msg": f"不支持的类型: {code_type}"}