feat(sql): Odbc provider — ANSI SQL:2008 profile over System.Data.Odbc (lmxopcua#753)

SqlProvider.Odbc is now constructed; every enum member is a working backend.

- OdbcDialect: System.Data.Odbc 10.0.14 (no vulnerable packages), ANSI double-
  quote quoting, positional `?` markers, INFORMATION_SCHEMA catalog (system
  schemas of the common backends excluded by name — the live gate caught
  psqlODBC listing pg_catalog), FETCH FIRST n ROWS ONLY limits, a conservative
  1000-parameter chunk. Positional binding is safe because every caller adds
  parameters in marker order (planner IN list, catalog schema-then-table).
- Named queries on a positional provider are checked by `?` count against the
  declared params (literals/comments ignored), since there is no name to match.
- Supported backends are those whose SQL accepts that profile (PostgreSQL via
  psqlODBC proven, Snowflake-like); SQL Server/MySQL/DB2 should use their native
  provider. The host needs the ODBC driver manager + vendor driver.
- Reserved-provider controls in factory/probe/browser tests now use an
  undeclared ordinal (99); the AdminUI form offers Odbc and a test pins the
  dropdown theory to SqlDialects.Supported.
- Tests: OdbcDialectTests (unit, any host). OdbcReadTests + Docker/odbc/
  run-odbc-gate.sh run the built suite in a throwaway Linux SDK container with
  unixODBC + psqlODBC against a throwaway seeded PostgreSQL: KV IN-list
  positional binding, where-pair, topByTimestamp via FETCH FIRST, a two-
  parameter named query, and the browse walk. macOS has no vendor ODBC driver,
  so there the suite skips.

(lmxopcua#753)

Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/Uns/SqlDriverFormContractTests.cs

@@ -102,6 +102,7 @@ public sealed class SqlDriverFormContractTests
     [InlineData(SqlProvider.Postgres, "Postgres")]
     [InlineData(SqlProvider.Oracle, "Oracle")]
     [InlineData(SqlProvider.MySql, "MySql")]
+    [InlineData(SqlProvider.Odbc, "Odbc")]
     public void Every_dropdown_provider_round_trips_through_the_form_model(SqlProvider provider, string name)
     {
         var form = new SqlDriverForm.FormModel { Provider = provider, ConnectionStringRef = "MesStaging" };
@@ -117,18 +118,16 @@ public sealed class SqlDriverFormContractTests
     }
 
     /// <summary>
-    ///     Odbc stays reserved-and-rejected in this build, so the dropdown deliberately does not offer it. Nothing in the form model blocks the value — this records the intent so a later "the enum has
-    ///     five members, the dropdown should too" edit has to argue with a test.
+    ///     The dropdown offers every provider the build constructs (lmxopcua#753 made all five enum members real),
+    ///     so the form-model theory above must cover exactly <see cref="SqlDialects.Supported"/> — a provider added
+    ///     to the map without a dropdown option (or the reverse) has to argue with this test.
     /// </summary>
-    [Theory]
-    [InlineData(SqlProvider.Odbc)]
-    public void Reserved_providers_are_not_offered_but_still_serialize_by_name(SqlProvider reserved)
-    {
-        var json = JsonSerializer.Serialize(
-            new SqlDriverForm.FormModel { Provider = reserved, ConnectionStringRef = "R" }.ToDto(), FormOptions);
+    [Fact]
+    public void Every_constructed_provider_is_covered_by_the_dropdown_theory()
+        => SqlDialects.Supported.ShouldBe(
+            [SqlProvider.SqlServer, SqlProvider.Postgres, SqlProvider.MySql, SqlProvider.Odbc, SqlProvider.Oracle],
+            ignoreOrder: true);
 
-        json.ShouldContain($"\"provider\":\"{reserved}\"");
-    }
     // ---- named queries (lmxopcua#753): the form refuses exactly what the factory refuses ----
 
     /// <summary>