fix(qe-m2-03): normalize libpq-style options parameter to Search Path for Npgsql compatibility

src/dotnet/QuantEngine.Core.Tests/HistoryIngestionPgTests.cs

@@ -50,11 +50,25 @@ namespace QuantEngine.Core.Tests
             string? successfulConnStr = null;
             foreach (var rawDsn in candidates)
             {
+                string connStr = rawDsn;
+                if (rawDsn.Contains("host=") || rawDsn.Contains("dbname="))
+                {
+                    connStr = rawDsn
+                        .Replace("options='-c search_path=quantengine'", "")
+                        .Replace("options=\"-c search_path=quantengine\"", "")
+                        .Replace("dbname=", "Database=")
+                        .Replace("user=", "Username=")
+                        .Replace("host=", "Host=")
+                        .Replace("port=", "Port=")
+                        .Trim();
+                    connStr = string.Join(";", connStr.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)) + ";Search Path=quantengine";
+                }
+
                 try
                 {
-                    using var conn = new NpgsqlConnection(rawDsn);
+                    using var conn = new NpgsqlConnection(connStr);
                     await conn.OpenAsync();
-                    successfulConnStr = rawDsn;
+                    successfulConnStr = connStr;
                     break; // Found working connection
                 }
                 catch