Rename EmailApiDbContext to EmailDbContext and EmailTemplates table to Templates

Refactoring:
- Rename EmailApiDbContext class to EmailDbContext for consistency with other DbContext naming
- Rename DbSet property from EmailTemplates to Templates
- Rename table from EmailTemplates to Templates
- Update all references in Program.cs files (email-api, api, cv-search-job)
- Update all migration files and model snapshot
- Fix cv-search-job migrations assembly name: email-api-data → email-data

This improves naming consistency across the solution.

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

Apis/email-data/Migrations/20260528100000_CreateEmailTemplates.Designer.cs

@@ -11,7 +11,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
 namespace Email.Data.Migrations
 {
-    [DbContext(typeof(EmailApiDbContext))]
+    [DbContext(typeof(EmailDbContext))]
     [Migration("20260528100000_CreateEmailTemplates")]
     partial class CreateEmailTemplates
     {

Apis/email-data/Migrations/20260528130652_SeedEmailTemplates.Designer.cs

@@ -11,7 +11,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
 namespace Email.Data.Migrations
 {
-    [DbContext(typeof(EmailApiDbContext))]
+    [DbContext(typeof(EmailDbContext))]
     [Migration("20260528130652_SeedEmailTemplates")]
     partial class SeedEmailTemplates
     {

Apis/email-data/Migrations/EmailDbContextModelSnapshot.cs

@@ -10,8 +10,8 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 
 namespace Email.Data.Migrations
 {
-    [DbContext(typeof(EmailApiDbContext))]
-    partial class EmailApiDbContextModelSnapshot : ModelSnapshot
+    [DbContext(typeof(EmailDbContext))]
+    partial class EmailDbContextModelSnapshot : ModelSnapshot
     {
         protected override void BuildModel(ModelBuilder modelBuilder)
         {
@@ -58,7 +58,7 @@ namespace Email.Data.Migrations
 
                     b.HasKey("Key", "Language");
 
-                    b.ToTable("EmailTemplates", MigrationConstants.SchemaName);
+                    b.ToTable("Templates", MigrationConstants.SchemaName);
                 });
 #pragma warning restore 612, 618
         }