feat(m9/T32a): SharedSchema entity + EF config + idempotent migration + repository

src/ZB.MOM.WW.ScadaBridge.Commons/Entities/Schemas/SharedSchema.cs

@@ -0,0 +1,32 @@
+namespace ZB.MOM.WW.ScadaBridge.Commons.Entities.Schemas;
+
+/// <summary>
+/// A reusable, named JSON-Schema library entry (M9 template-level JSON-Schema library,
+/// Task T32a). Schemas are referenced from inbound-API / template schema definitions via a
+/// <c>{"$ref":"lib:Name"}</c> pointer resolved against this library (the resolver lands in
+/// T32b). One row per named schema in the central <c>SharedSchemas</c> MS SQL table.
+/// </summary>
+/// <remarks>
+/// Persistence-ignorant POCO; the EF Core mapping lives in the Configuration Database
+/// component (<c>SharedSchemaConfiguration</c>). Mirrors the single-table
+/// <see cref="ZB.MOM.WW.ScadaBridge.Commons.Entities.Scripts.SharedScript"/> entity/config/
+/// repository shape — surrogate <c>Id</c>, a unique <see cref="Name"/>, and an unbounded
+/// text body.
+/// </remarks>
+public class SharedSchema
+{
+    /// <summary>Primary key.</summary>
+    public int Id { get; set; }
+
+    /// <summary>Unique schema name used to reference this entry (e.g. <c>lib:Name</c>).</summary>
+    public required string Name { get; set; }
+
+    /// <summary>
+    /// Optional scope discriminator for future namespacing/visibility partitioning;
+    /// <c>null</c> means an unscoped (global) library entry.
+    /// </summary>
+    public string? Scope { get; set; }
+
+    /// <summary>The JSON Schema document text.</summary>
+    public required string SchemaJson { get; set; }
+}