988ee7335a
新增文件： - sensitive_words.dart — 8 分类 ~200 条敏感词 + 谐音/形近/数字变体映射 - content_filter_service.dart — 精确匹配 + 变体匹配 + 文本预处理（去零宽/空格/符号） - content_filter_service_test.dart — 28 个测试（8分类精确/安全内容/预处理/变体/边界/词库完整性） 修改： - share_bottom_sheet.dart — 分享到班级前调用 ContentFilterService， 有敏感词时弹出警告对话框（返回修改/仍然分享），新增 contentText 参数
nuanji_app
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