feat: add preset rule import functionality and update related messages

pkg/rule/preset.go

@@ -0,0 +1,55 @@
+package rule
+
+import "path"
+
+// PresetCategory describes a built-in filetype classification: files whose name
+// matches Regex are routed into the Dir subdirectory (joined with a user base path).
+type PresetCategory struct {
+	// Name is a stable identifier for the category (used in logs/messages).
+	Name string
+	// Regex is a FILENAME-REGEX rule data string matching this category's extensions.
+	Regex string
+	// Dir is the default subdirectory name for this category.
+	Dir string
+}
+
+// presetCategories holds the default filetype classification rules.
+// Regexes are case-insensitive and match common file extensions.
+var presetCategories = []PresetCategory{
+	{
+		Name:  "video",
+		Regex: `(?i)\.(mp4|mkv|ts|avi|flv|mov|webm|wmv|rmvb|m2ts)$`,
+		Dir:   "视频",
+	},
+	{
+		Name:  "image",
+		Regex: `(?i)\.(jpg|jpeg|png|gif|webp|bmp)$`,
+		Dir:   "图片",
+	},
+	{
+		Name:  "audio",
+		Regex: `(?i)\.(mp3|flac|wav|aac|m4a|ogg)$`,
+		Dir:   "音频",
+	},
+	{
+		Name:  "document",
+		Regex: `(?i)\.(pdf|doc|docx|xls|xlsx|ppt|pptx|txt|md|csv|epub|mobi|azw3|chm)$`,
+		Dir:   "文档",
+	},
+	{
+		Name:  "archive",
+		Regex: `(?i)\.(zip|rar|7z|tar|gz|bz2|xz|r\d{1,3}|z\d{1,3}|\d{3}|part\d+\.rar|7z\.\d{3})$`,
+		Dir:   "压缩包",
+	},
+}
+
+// PresetCategories returns the built-in filetype classification rules with each
+// category's directory joined under basePath. basePath may be empty.
+func PresetCategories(basePath string) []PresetCategory {
+	out := make([]PresetCategory, len(presetCategories))
+	for i, c := range presetCategories {
+		c.Dir = path.Join(basePath, c.Dir)
+		out[i] = c
+	}
+	return out
+}