feat(s7): STRING/WSTRING/CHAR/WCHAR and DTL/DATE/TOD/TIME/S5TIME codecs, TSAP/connection-type override, negotiated PDU surfaced (#632 #288 #289 #294 #295)

New S7DataType members WString/Char/WChar/Dtl/Date/Tod/Time/S5Time mapped onto existing
DriverDataType (String / DateTime / Int32 ms); writes refuse out-of-range with BadOutOfRange.
Optional localTsap/remoteTsap/connectionType through options, factory JSON, probe and AdminUI form.
NegotiatedPduSize snapshotted at connect and exposed via GetDiagnostics (DriverHealth has no bag).

Claude-Session: https://claude.ai/code/session_01Ef2ozxS7QPanGT8uoATbTe

src/Drivers/ZB.MOM.WW.OtOpcUa.Driver.S7/S7DriverProbe.cs

@@ -66,7 +66,11 @@ public sealed class S7DriverProbe : IDriverProbe
         // The Plc is opened and immediately closed — no reads or writes are performed.
         // Use a linked CTS so we can distinguish a real caller cancellation from
         // S7netplus's internal socket-read timeout (which also surfaces as OCE).
-        var plc = new Plc(S7CpuTypeMap.ToS7Net(opts.CpuType), host, port, opts.Rack, opts.Slot);
+        // An authored TSAP / connection-type override applies to Test Connect too — otherwise the probe
+        // would succeed (or fail) on a different handshake than the driver will use.
+        var plc = S7Tsap.Resolve(opts) is { } tsap
+            ? new Plc(host, port, tsap)
+            : new Plc(S7CpuTypeMap.ToS7Net(opts.CpuType), host, port, opts.Rack, opts.Slot);
         plc.ReadTimeout = (int)timeout.TotalMilliseconds;
         using var handshakeCts = CancellationTokenSource.CreateLinkedTokenSource(ct);
         handshakeCts.CancelAfter(timeout);
@@ -76,7 +80,7 @@ public sealed class S7DriverProbe : IDriverProbe
             sw.Stop();
 
             if (plc.IsConnected)
-                return new(true, $"S7 connected (CPU {opts.CpuType})", sw.Elapsed);
+                return new(true, $"S7 connected (CPU {opts.CpuType}, PDU {plc.MaxPDUSize} bytes)", sw.Elapsed);
 
             return new(false, $"Reachable at {host}:{port} but S7 handshake failed: not connected", null);
         }