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/Sound/CreateSoundEndpoint.cs

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

PyroFetes/Endpoints/Sound/DeleteSoundEndpoint.cs

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

PyroFetes/Endpoints/Sound/GetAllSoundsEndpoint.cs

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

PyroFetes/Endpoints/Sound/GetSoundEndpoint.cs

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

PyroFetes/Endpoints/Sound/UpdateSoundEndpoint.cs

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