sync: clean stale local pricelists and migrate runtime config handling

internal/appstate/path.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"strings"
 )
 
 const (
@@ -55,6 +56,25 @@ func ResolveConfigPath(explicitPath string) (string, error) {
 	return filepath.Join(dir, defaultCfg), nil
 }
 
+// ResolveConfigPathNearDB returns config path using priority:
+// explicit CLI path > QFS_CONFIG_PATH > directory of resolved local DB path.
+// Falls back to ResolveConfigPath when dbPath is empty.
+func ResolveConfigPathNearDB(explicitPath, dbPath string) (string, error) {
+	if explicitPath != "" {
+		return filepath.Clean(explicitPath), nil
+	}
+
+	if fromEnv := os.Getenv(envCfgPath); fromEnv != "" {
+		return filepath.Clean(fromEnv), nil
+	}
+
+	if strings.TrimSpace(dbPath) != "" {
+		return filepath.Join(filepath.Dir(filepath.Clean(dbPath)), defaultCfg), nil
+	}
+
+	return ResolveConfigPath("")
+}
+
 // MigrateLegacyDB copies an existing legacy DB (and optional SQLite sidecars)
 // to targetPath if targetPath does not already exist.
 // Returns source path if migration happened.