feat: use authored category names for mods

Store categories as authored strings. Trim and deduplicate without changing case, compare without case sensitivity, and keep all observed categories available to filters and editors.

locale/ui_zh.properties

@@ -57,20 +57,20 @@ mods/catalog_export = 导出到目录
 mods/catalog_title = 导出目录条目
 mods/catalog_download_url = 下载 URL
 mods/catalog_category = 分类
-mods/category_story = 剧情
-mods/category_characters = 角色
-mods/category_gameplay = 玩法
-mods/category_visual = 视觉
-mods/category_audio = 音频
-mods/category_ui = 界面
-mods/category_locale = 语言
-mods/category_library = 库
-mods/category_engine = 引擎
-mods/category_overhaul = 大型改动
-mods/category_tools = 工具
-mods/category_editor = 编辑器
-mods/category_debug = 调试
-mods/category_other = 其他
+mod_category/story = 剧情
+mod_category/characters = 角色
+mod_category/gameplay = 玩法
+mod_category/visual = 视觉
+mod_category/audio = 音频
+mod_category/ui = 界面
+mod_category/locale = 语言
+mod_category/library = 库
+mod_category/engine = 引擎
+mod_category/overhaul = 大型改动
+mod_category/tools = 工具
+mod_category/editor = 编辑器
+mod_category/debug = 调试
+mod_category/other = 其他
 mods/catalog_tags = 标签（逗号分隔）
 mods/catalog_changelog = 更新日志
 mods/catalog_status = 状态