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/Show/CreateShowEndpoint.cs

@@ -8,7 +8,7 @@ public class CreateShowEndpoint(PyroFetesDbContext pyroFetesDbContext) : Endpoin
 {
     public override void Configure()
     {
-        Post("/api/shows");
+        Post("/shows");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Show/DeleteShowEndpoint.cs

@@ -8,7 +8,7 @@ public class DeleteShowEndpoint(PyroFetesDbContext pyroFetesDbContext) : Endpoin
 {
     public override void Configure()
     {
-        Delete("/api/shows/{Id}");
+        Delete("/shows/{Id}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Show/GetAllShowsEndpoint.cs

@@ -8,7 +8,7 @@ public class GetAllShowsEndpoint(PyroFetesDbContext pyroFetesDbContext) : Endpoi
 {
     public override void Configure()
     {
-        Get("/api/shows");
+        Get("/shows");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Show/GetShowEndpoint.cs

@@ -9,7 +9,7 @@ public class GetShowEndpoint(PyroFetesDbContext pyroFetesDbContext) : Endpoint<I
 {
     public override void Configure()
     {
-        Get("/api/shows/{Id}");
+        Get("/shows/{Id}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/Show/UpdateShowEndpoint.cs

@@ -9,7 +9,7 @@ public class UpdateShowEndpoint(PyroFetesDbContext pyroFetesDbContext) : Endpoin
 {
     public override void Configure()
     {
-        Put("/api/shows/{Id}");
+        Put("/shows/{Id}");
         AllowAnonymous();
     }