Enhance crawler with seed list and SQL utilities

Add seedList module for URL initialization, comprehensive SQL utilities for database analysis, and update project configuration.

common/seedList/seedlist.go

@@ -0,0 +1,67 @@
+package seedList
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"git.antanst.com/antanst/logging"
+	"git.antanst.com/antanst/xerrors"
+)
+
+var seedlist []string //nolint:gochecknoglobals
+
+func Initialize() error {
+	var err error
+
+	// Initialize seedlist from fixed path
+	if err = loadSeedlist("seed_urls.txt"); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func loadSeedlist(filePath string) error {
+	if seedlist != nil {
+		return nil
+	}
+
+	data, err := os.ReadFile(filePath)
+	if err != nil {
+		seedlist = []string{}
+		return xerrors.NewError(fmt.Errorf("could not load seedlist file: %w", err), 0, "", true)
+	}
+
+	lines := strings.Split(string(data), "\n")
+	seedlist = []string{}
+
+	for _, line := range lines {
+		line = strings.TrimSpace(line)
+		if line == "" || strings.HasPrefix(line, "#") {
+			continue
+		}
+		seedlist = append(seedlist, line)
+	}
+
+	if len(seedlist) > 0 {
+		logging.LogInfo("Loaded %d seed URLs", len(seedlist))
+	}
+
+	return nil
+}
+
+func Shutdown() error {
+	return nil
+}
+
+// GetSeedURLs returns the list of seed URLs
+func GetSeedURLs() []string {
+	if seedlist == nil {
+		return []string{}
+	}
+	// Return a copy to prevent external modification
+	result := make([]string, len(seedlist))
+	copy(result, seedlist)
+	return result
+}