make sync command configurable via appsettings

Program.cs

@@ -213,12 +213,15 @@ app.MapGet("/api/entry-chains", (Func<SqliteConnection> factory, string from, st
 // POST /api/sync - run export.mjs to import new entries
 app.MapPost("/api/sync", async () =>
 {
-    var wd = "/home/node/.openclaw/workspace/projects/token-analytics/jsonl-sync";
-    var psi = new System.Diagnostics.ProcessStartInfo("docker", $"exec meleki node {wd}/export.mjs")
+    var config = app.Configuration;
+    var wd = config["SyncWorkingDirectory"] ?? "/opt/token-analytics/jsonl-sync";
+    var fileName = config["SyncCommandFileName"] ?? "node";
+    var arguments = config["SyncCommandArguments"] ?? "/opt/token-analytics/jsonl-sync/export.mjs";
+    var psi = new System.Diagnostics.ProcessStartInfo(fileName, arguments)
     {
         RedirectStandardOutput = true,
         RedirectStandardError = true,
-        WorkingDirectory = wd!
+        WorkingDirectory = wd
     };
     var proc = System.Diagnostics.Process.Start(psi)!;
     var stdout = await proc.StandardOutput.ReadToEndAsync();