style(backend): apply dotnet format whitespace normalization

- Applied dotnet format to 24 files in backend/
- Corrects spacing, indentation, and formatting consistency
- No functional changes to code logic

Ultraworked with Sisyphus <https://github.com/code-yeongyu/oh-my-opencode>
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/WorkClub.Api/Endpoints/Shifts/ShiftEndpoints.cs

@@ -56,7 +56,7 @@ public static class ShiftEndpoints
         ShiftService shiftService)
     {
         var result = await shiftService.GetShiftByIdAsync(id);
-        
+
         if (result == null)
             return TypedResults.NotFound();
 
@@ -75,7 +75,7 @@ public static class ShiftEndpoints
         }
 
         var (shift, error) = await shiftService.CreateShiftAsync(request, createdById);
-        
+
         if (error != null || shift == null)
             return TypedResults.BadRequest(error ?? "Failed to create shift");
 
@@ -93,7 +93,7 @@ public static class ShiftEndpoints
         {
             if (error == "Shift not found")
                 return TypedResults.NotFound();
-            
+
             if (isConflict)
                 return TypedResults.Conflict(error);
         }
@@ -106,7 +106,7 @@ public static class ShiftEndpoints
         ShiftService shiftService)
     {
         var deleted = await shiftService.DeleteShiftAsync(id);
-        
+
         if (!deleted)
             return TypedResults.NotFound();
 
@@ -130,10 +130,10 @@ public static class ShiftEndpoints
         {
             if (error == "Shift not found")
                 return TypedResults.NotFound();
-            
+
             if (error == "Cannot sign up for past shifts")
                 return TypedResults.UnprocessableEntity(error);
-            
+
             if (isConflict)
                 return TypedResults.Conflict(error!);
         }
@@ -158,7 +158,7 @@ public static class ShiftEndpoints
         {
             if (error == "Sign-up not found")
                 return TypedResults.NotFound();
-            
+
             return TypedResults.UnprocessableEntity(error!);
         }
 

backend/WorkClub.Api/Endpoints/Tasks/TaskEndpoints.cs

@@ -47,7 +47,7 @@ public static class TaskEndpoints
         TaskService taskService)
     {
         var result = await taskService.GetTaskByIdAsync(id);
-        
+
         if (result == null)
             return TypedResults.NotFound();
 
@@ -66,7 +66,7 @@ public static class TaskEndpoints
         }
 
         var (task, error) = await taskService.CreateTaskAsync(request, createdById);
-        
+
         if (error != null || task == null)
             return TypedResults.BadRequest(error ?? "Failed to create task");
 
@@ -84,10 +84,10 @@ public static class TaskEndpoints
         {
             if (error == "Task not found")
                 return TypedResults.NotFound();
-            
+
             if (isConflict)
                 return TypedResults.Conflict(error);
-            
+
             return TypedResults.UnprocessableEntity(error);
         }
 
@@ -99,7 +99,7 @@ public static class TaskEndpoints
         TaskService taskService)
     {
         var deleted = await taskService.DeleteTaskAsync(id);
-        
+
         if (!deleted)
             return TypedResults.NotFound();