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/SoundTimecode/CreateSoundTimecodeEndpoint.cs

@@ -8,7 +8,7 @@ public class CreateSoundTimecodeEndpoint(PyroFetesDbContext pyroFetesDbContext)
 {
     public override void Configure()
     {
-        Post("/api/soundtimecodes");
+        Post("/soundtimecodes");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/SoundTimecode/DeleteSoundTimecodeEndpoint.cs

@@ -14,7 +14,7 @@ public class DeleteSoundTimecodeEndpoint(PyroFetesDbContext pyroFetesDbContext)
 {
     public override void Configure()
     {
-        Delete("/api/soundtimecodes/{ShowId}/{SoundId}");
+        Delete("/soundtimecodes/{ShowId}/{SoundId}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/SoundTimecode/GetAllSoundTimecodesEndpoint.cs

@@ -8,7 +8,7 @@ public class GetAllSoundTimecodesEndpoint(PyroFetesDbContext pyroFetesDbContext)
 {
     public override void Configure()
     {
-        Get("/api/soundtimecodes");
+        Get("/soundtimecodes");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/SoundTimecode/GetSoundTimecodeEndpoint.cs

@@ -15,7 +15,7 @@ public class GetSoundTimecodeEndpoint(PyroFetesDbContext pyroFetesDbContext) : E
 {
     public override void Configure()
     {
-        Get("/api/soundtimecodes/{ShowId}/{SoundId}");
+        Get("/soundtimecodes/{ShowId}/{SoundId}");
         AllowAnonymous();
     }
 

PyroFetes/Endpoints/SoundTimecode/UpdateSoundTimecodeEndpoint.cs

@@ -18,7 +18,7 @@ public class UpdateSoundTimecodeEndpoint(PyroFetesDbContext pyroFetesDbContext)
 {
     public override void Configure()
     {
-        Put("/api/soundtimecodes/{ShowId}/{SoundId}");
+        Put("/soundtimecodes/{ShowId}/{SoundId}");
         AllowAnonymous();
     }