Simplify: auto-deny all domains starting with digits

Replaced complex checks (digit-dash, all-digit hostname) with simple rule:
deny any domain starting with a digit, except 1440.news.

Database: denied 2,870,090 domains and 24,885 feeds.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

domain.go

@@ -31,33 +31,10 @@ func shouldAutoDenyDomain(host string) bool {
 	if strings.HasSuffix(host, "1440.news") || host == "1440.news" {
 		return false
 	}
-	// Deny domains starting with digit followed by dash (e.g., "0-example.com")
-	if len(host) >= 2 && host[0] >= '0' && host[0] <= '9' && host[1] == '-' {
+	// Deny domains starting with a digit (spam pattern)
+	if len(host) > 0 && host[0] >= '0' && host[0] <= '9' {
 		return true
 	}
-	// Deny domains where hostname is all digits (e.g., "0000114.com")
-	// Extract the part before the TLD
-	dotIdx := strings.LastIndex(host, ".")
-	if dotIdx > 0 {
-		name := host[:dotIdx]
-		// Remove any subdomain prefix (get last part before TLD)
-		if lastDot := strings.LastIndex(name, "."); lastDot >= 0 {
-			name = name[lastDot+1:]
-		}
-		// Check if it's all digits
-		if len(name) > 0 {
-			allDigits := true
-			for _, c := range name {
-				if c < '0' || c > '9' {
-					allDigits = false
-					break
-				}
-			}
-			if allDigits {
-				return true
-			}
-		}
-	}
 	return false
 }