feat: Prism HTTP/SOCKS5 代理网关及管理台

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/api/pagination.go

@@ -0,0 +1,35 @@
+package api
+
+import "strconv"
+
+const (
+	defaultPageLimit = 50
+	maxPageLimit     = 500
+)
+
+func parseLimitOffset(limitStr, offsetStr string) (limit, offset int) {
+	limit, _ = strconv.Atoi(limitStr)
+	offset, _ = strconv.Atoi(offsetStr)
+	if limit <= 0 {
+		limit = defaultPageLimit
+	}
+	if limit > maxPageLimit {
+		limit = maxPageLimit
+	}
+	if offset < 0 {
+		offset = 0
+	}
+	return limit, offset
+}
+
+func paginateSlice[T any](items []T, limit, offset int) ([]T, int) {
+	total := len(items)
+	if offset >= total {
+		return nil, total
+	}
+	end := offset + limit
+	if end > total {
+		end = total
+	}
+	return items[offset:end], total
+}