初版功能完成

internal/bootstrap/server_id.go

@@ -0,0 +1,30 @@
+package bootstrap
+
+import (
+	"context"
+
+	"github.com/google/uuid"
+
+	"remlink/internal/database"
+)
+
+const serverIDSetting = "server_id"
+
+// EnsureServerID returns the stable Server UUID stored in SQLite.
+func EnsureServerID(ctx context.Context, store *database.Store) (string, error) {
+	value, found, err := database.GetSetting(ctx, store.DB(), serverIDSetting)
+	if err != nil {
+		return "", err
+	}
+	if found {
+		if _, err := uuid.Parse(value); err != nil {
+			return "", err
+		}
+		return value, nil
+	}
+	value = uuid.NewString()
+	if err := database.SetSetting(ctx, store.DB(), serverIDSetting, value); err != nil {
+		return "", err
+	}
+	return value, nil
+}