chore: remove remaining QuoteForge/qfs references

internal/appstate/path.go

@@ -9,8 +9,8 @@ import (
 )
 
 const (
-	appDirName  = "QuoteForge"
-	defaultDB   = "qfs.db"
+	appDirName  = "PriceForge"
+	defaultDB   = "pfs.db"
 	defaultCfg  = "config.yaml"
 	envDBPath   = "QFS_DB_PATH"
 	envStateDir = "QFS_STATE_DIR"
@@ -149,13 +149,13 @@ func defaultStateDir() (string, error) {
 		return filepath.Join(base, appDirName), nil
 	default:
 		if xdgState := os.Getenv("XDG_STATE_HOME"); xdgState != "" {
-			return filepath.Join(xdgState, "quoteforge"), nil
+			return filepath.Join(xdgState, "priceforge"), nil
 		}
 		home, err := os.UserHomeDir()
 		if err != nil {
 			return "", fmt.Errorf("resolving user home dir: %w", err)
 		}
-		return filepath.Join(home, ".local", "state", "quoteforge"), nil
+		return filepath.Join(home, ".local", "state", "priceforge"), nil
 	}
 }