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/Services/MemberSyncService.cs

@@ -42,7 +42,7 @@ public class MemberSyncService
 
         var email = httpContext.User.FindFirst("email")?.Value ?? httpContext.User.FindFirst("preferred_username")?.Value ?? "unknown@example.com";
         var name = httpContext.User.FindFirst("name")?.Value ?? email.Split('@')[0];
-        
+
         var roleClaim = httpContext.User.FindFirst(System.Security.Claims.ClaimTypes.Role)?.Value ?? "Member";
         var clubRole = roleClaim.ToLowerInvariant() switch
         {

backend/WorkClub.Api/Services/ShiftService.cs

@@ -57,7 +57,7 @@ public class ShiftService
     public async Task<ShiftDetailDto?> GetShiftByIdAsync(Guid id)
     {
         var shift = await _context.Shifts.FindAsync(id);
-        
+
         if (shift == null)
             return null;
 
@@ -91,7 +91,7 @@ public class ShiftService
     public async Task<(ShiftDetailDto? shift, string? error)> CreateShiftAsync(CreateShiftRequest request, Guid createdById)
     {
         var tenantId = _tenantProvider.GetTenantId();
-        
+
         var shift = new Shift
         {
             Id = Guid.NewGuid(),
@@ -132,7 +132,7 @@ public class ShiftService
     public async Task<(ShiftDetailDto? shift, string? error, bool isConflict)> UpdateShiftAsync(Guid id, UpdateShiftRequest request)
     {
         var shift = await _context.Shifts.FindAsync(id);
-        
+
         if (shift == null)
             return (null, "Shift not found", false);
 
@@ -197,7 +197,7 @@ public class ShiftService
     public async Task<bool> DeleteShiftAsync(Guid id)
     {
         var shift = await _context.Shifts.FindAsync(id);
-        
+
         if (shift == null)
             return false;
 
@@ -212,7 +212,7 @@ public class ShiftService
         var tenantId = _tenantProvider.GetTenantId();
 
         var shift = await _context.Shifts.FindAsync(shiftId);
-        
+
         if (shift == null)
             return (false, "Shift not found", false);
 

backend/WorkClub.Api/Services/TaskService.cs

@@ -52,7 +52,7 @@ public class TaskService
     public async Task<TaskDetailDto?> GetTaskByIdAsync(Guid id)
     {
         var workItem = await _context.WorkItems.FindAsync(id);
-        
+
         if (workItem == null)
             return null;
 
@@ -73,7 +73,7 @@ public class TaskService
     public async Task<(TaskDetailDto? task, string? error)> CreateTaskAsync(CreateTaskRequest request, Guid createdById)
     {
         var tenantId = _tenantProvider.GetTenantId();
-        
+
         var workItem = new WorkItem
         {
             Id = Guid.NewGuid(),
@@ -111,7 +111,7 @@ public class TaskService
     public async Task<(TaskDetailDto? task, string? error, bool isConflict)> UpdateTaskAsync(Guid id, UpdateTaskRequest request)
     {
         var workItem = await _context.WorkItems.FindAsync(id);
-        
+
         if (workItem == null)
             return (null, "Task not found", false);
 
@@ -172,7 +172,7 @@ public class TaskService
     public async Task<bool> DeleteTaskAsync(Guid id)
     {
         var workItem = await _context.WorkItems.FindAsync(id);
-        
+
         if (workItem == null)
             return false;