v3.1.9

修复

• 人声分离 / 本地 Whisper：修复当 Windows 用户名包含非 ASCII 字符（中文、日文、韩文）时，内置原生工具（BS-Roformer 人声分离、whisper.cpp、CTC 对齐、VAD）以「Failed to open file for writing」失败的问题。这些工具会在 %TEMP% 下创建自己的临时文件，而含中文用户名的路径会被破坏；MioSub 现在将子进程的临时目录指向 ASCII 安全的位置。
• 设置：清洗 API 密钥输入——将密钥连同周围文本（备注、全角空格）一起粘贴时，不会再以「String contains non ISO-8859-1 code point」导致生成崩溃。
• 设置：清洗并校验自定义 API 端点输入。多余的空格和结尾的 /v1 现在会被自动处理（后者是第三方中转翻译/润色失败的最大单一原因，会产生畸形的 /v1/v1beta/... 请求地址），端点格式非法时会显示行内提示。

Fixes

• Vocal Separation / Local Whisper: Fix bundled native tools (BS-Roformer vocal separation, whisper.cpp, CTC aligner, VAD) failing with "Failed to open file for writing" for users whose Windows username contains non-ASCII characters (Chinese, Japanese, Korean). These tools create their own scratch files under %TEMP%, whose path was corrupted by the CJK username; MioSub now points the child process's temp directory to an ASCII-safe location.
• Settings: Sanitize the API key inputs so a key pasted together with surrounding text (a note, a full-width space) no longer crashes generation with "String contains non ISO-8859-1 code point".
• Settings: Sanitize and validate the custom API endpoint inputs. Stray whitespace and a trailing /v1 are now handled automatically (the latter was the single largest cause of translation/refinement failures on third-party proxies, producing a malformed /v1/v1beta/... request URL), and an invalid endpoint shows an inline warning.