fix(drivers): serialize driver-config enums as strings in AdminUI pages + probes

AdminUI driver-instance pages serialized enum config fields (S7 CpuType,
Modbus DataType/Region, AbCip PlcFamily, ...) as JSON *numbers* because each
page's _jsonOpts lacked a JsonStringEnumConverter. The driver factories,
however, deserialize into string-typed DTOs (+ lenient ParseEnum) and throw
when binding a JSON number to a string? — so an AdminUI-authored config
containing any enum field produced a blob the driver could not parse,
faulting the driver on deploy. Proven end-to-end for S7 and Modbus; latent
for AbCip/AbLegacy/TwinCAT/FOCAS/Galaxy/Historian. Only OpcUaClient was safe
(its factory + probe already carried the converter).

Add JsonStringEnumConverter to all 9 driver-instance pages' _jsonOpts and the
8 missing driver probes' _opts (factories unchanged — already string-via-
ParseEnum; strictly more permissive, also lets pages load hand-seeded
string-enum configs back into the form).

Also fix DriverProbeHandshakeE2eTests.AbCip_Green_AgainstSim to probe a real
sim tag (TestDINT) — the no-tags @raw_cpu_type fallback is rejected by the
ab_server sim with ErrorBadParam (a real ControlLogix returns ErrorNotFound,
which the probe treats as reachable; hardware-gated follow-up).

Tests: reflection guard over all driver pages' _jsonOpts (AdminUI.Tests);
factory round-trip + numeric-form-throws guards for S7 and Modbus.

Found by running the never-before-run FB-9/FB-10 live verifies.

tests/Server/ZB.MOM.WW.OtOpcUa.Host.IntegrationTests/DriverProbeHandshakeE2eTests.cs

@@ -172,8 +172,16 @@ public sealed class DriverProbeHandshakeE2eTests
     public async Task AbCip_Green_AgainstSim()
     {
         SkipUnless(DockerHost, AbCipPort);
+        // Probe an explicit tag that the ab_server ControlLogix sim actually defines
+        // (`TestDINT:DINT[1]`). The no-tags fallback (`@raw_cpu_type`) is NOT exercised here:
+        // ab_server answers an unknown/unsupported tag with libplctag ErrorBadParam (a REAL
+        // ControlLogix instead returns ErrorNotFound, which the probe classifies as
+        // reachable). Whether the `@raw_cpu_type` system-tag fallback is valid on a real
+        // ControlLogix is a hardware-gated follow-up (AbCipDriverOptions.cs flags it deferred).
         var result = await new AbCipDriverProbe().ProbeAsync(
-            $"{{\"Devices\":[{{\"HostAddress\":\"ab://{DockerHost}:{AbCipPort}/1,0\"}}]}}", Timeout, Ct);
+            $"{{\"Devices\":[{{\"HostAddress\":\"ab://{DockerHost}:{AbCipPort}/1,0\"}}]," +
+            $"\"Tags\":[{{\"DeviceHostAddress\":\"ab://{DockerHost}:{AbCipPort}/1,0\",\"TagPath\":\"TestDINT\"}}]}}",
+            Timeout, Ct);
         result.Ok.ShouldBeTrue($"Probe message: {result.Message}");
         result.Message!.ShouldContain("CIP session OK");
     }