Remove /api prefix from all routes and fix CityId FK constraint

- Strip /api prefix from all endpoint routes
- Make Show.CityId nullable (no longer required FK)
- Drop CityId FK constraint and alter column to NULL at startup via raw SQL
- Add migration MakeCityIdNullable for schema consistency
- Update Show DTOs to reflect nullable CityId

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

PyroFetes/Endpoints/Staff/CreateStaffEndpoint.cs

@@ -8,7 +8,7 @@ public class CreateStaffEndpoint(PyroFetesDbContext pf3DbContext):Endpoint<Creat
 {
     public override void Configure()
     {
-        Post("/api/staff");
+        Post("/staff");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Staff/DeleteStaffEndpoint.cs

@@ -8,7 +8,7 @@ public class DeleteStaffEndpoint(PyroFetesDbContext pf3DbContext) : Endpoint<IdS
 {
     public override void Configure()
     {
-        Delete("/api/staff/{Id}");
+        Delete("/staff/{Id}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Staff/GetAllStaffEndpoint.cs

@@ -8,7 +8,7 @@ public class GetAllStaffEndpoint(PyroFetesDbContext pf3DbContext) : EndpointWith
 {
     public override void Configure()
     {
-        Get("/api/staff");
+        Get("/staff");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Staff/GetStaffEndpoint.cs

@@ -9,7 +9,7 @@ public class GetStaffEndpoint(PyroFetesDbContext pf3DbContext) : Endpoint<IdStaf
 {
     public override void Configure()
     {
-        Get("/api/staff/{Id}");
+        Get("/staff/{Id}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Staff/UpdateStaffEndpoint.cs

@@ -9,7 +9,7 @@ public class UpdateStaffEndpoint(PyroFetesDbContext pf3DbContext) : Endpoint<Upd
 {
     public override void Configure()
     {
-        Put("/api/staff/{Id}");
+        Put("/staff/{Id}");
         AllowAnonymous();
     }