fix: Standardize EF Core migrations table names for consistency

- Rename EmailApiDbContext MigrationTableName from '_EmailApiMigrations' to '_Migrations'
- Rename MyAiDbContext MigrationTableName from '_MyAiMigrations' to '_Migrations'
- Add migrations to rename tables in database: emailApi._EmailApiMigrations → emailApi._Migrations, myAi._MyAiMigrations → myAi._Migrations
- Aligns with naming convention used in other schemas (cvMatcher, cvSearch, rag)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Apis/myai-data/Migrations/20260528151850_RenameEFMigrationsTable.cs

@@ -0,0 +1,24 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace MyAi.Data.Migrations
+{
+    /// <inheritdoc />
+    public partial class RenameEFMigrationsTable : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            // Rename the EF Core migrations history table to match naming convention
+            migrationBuilder.Sql("EXEC sp_rename '[myAi].[_MyAiMigrations]', '_Migrations'");
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            // Revert the rename
+            migrationBuilder.Sql("EXEC sp_rename '[myAi].[_Migrations]', '_MyAiMigrations'");
+        }
+    }
+}