refactor(audit): consolidate query-param parsers; widen CLI export to multi-value

tests/ScadaLink.CLI.Tests/Commands/AuditQueryCommandTests.cs

@@ -76,7 +76,7 @@ public class AuditQueryCommandTests
         Assert.Equal("ApiCallCached", parsed["kind"]);
         Assert.Equal("Delivered", parsed["status"]);
         Assert.Equal("site-1", parsed["sourceSiteId"]);
-        // --instance was dropped: AuditLogQueryFilter has no instance column.
+        // The CLI audit query has no --instance flag, so no instance param is emitted.
         Assert.Null(parsed["instance"]);
         Assert.Equal("weather-api", parsed["target"]);
         Assert.Equal("multi-role", parsed["actor"]);