v3(b1-twincat): apply Modbus exemplar pattern to TwinCAT (multi-device)

- Rename TwinCATEquipmentTagParser -> TwinCATTagDefinitionFactory; TryParse ->
  FromTagConfig(tagConfig, rawPath, out def). Drop leading-'{' heuristic + the
  deviceHostAddress key; def.Name = rawPath. Keep strict-enum + Inspect; add a
  Structure guard (sole tag path now) + inverse ToTagConfig.
- Options: Tags -> RawTags (RawTagEntry); keep Devices + protocol fields.
- Driver: _tagsByRawPath (Ordinal); byName-only resolver; build table from
  _options.RawTags via FromTagConfig, threading WriteIdempotent + DeviceName.
  Multi-device: ResolveDeviceHost matches entry.DeviceName against options.Devices
  (by name, then host) -> def.DeviceHostAddress (TODO(v3 WaveC): live host from the
  Device row's DeviceConfig). DiscoverAsync now emits from the table.
- Factory: retire pre-declared tags[] DTO path; bind rawTags; keep Devices.
- Cli: BuildOptions serialises typed defs -> RawTagEntry via ToTagConfig.
- Tests: TwinCATRawTags helper; migrate Tags= -> RawTags=; rename parser tests to
  FromTagConfig; equipment/resolve-host/array tests delivered via RawTags.

Gate: Contracts + Driver build green; Driver.TwinCAT.Tests 192 pass, Cli.Tests 70 pass.

tests/Drivers/ZB.MOM.WW.OtOpcUa.Driver.TwinCAT.Tests/TwinCATConnectBackoffTests.cs

@@ -20,7 +20,7 @@ public sealed class TwinCATConnectBackoffTests
     private static TwinCATDriverOptions Options(bool probeEnabled) => new()
     {
         Devices = [new TwinCATDeviceOptions(Host)],
-        Tags = [new TwinCATTagDefinition("T", Host, "MAIN.T", TwinCATDataType.DInt)],
+        RawTags = TwinCATRawTags.Entries([new TwinCATTagDefinition("T", Host, "MAIN.T", TwinCATDataType.DInt)]),
         Probe = new TwinCATProbeOptions
         {
             Enabled = probeEnabled,