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.Infrastructure/Data/Interceptors/TenantDbConnectionInterceptor.cs

@@ -29,7 +29,7 @@ public class TenantDbConnectionInterceptor : DbConnectionInterceptor
         await base.ConnectionOpeningAsync(connection, eventData, result, cancellationToken);
 
         var tenantId = _tenantAccessor.MultiTenantContext?.TenantInfo?.Identifier;
-        
+
         if (string.IsNullOrWhiteSpace(tenantId))
         {
             _logger.LogWarning("No tenant context available for database connection");
@@ -40,7 +40,7 @@ public class TenantDbConnectionInterceptor : DbConnectionInterceptor
         {
             await using var command = npgsqlConnection.CreateCommand();
             command.CommandText = $"SET LOCAL app.current_tenant_id = '{tenantId}'";
-            
+
             try
             {
                 await command.ExecuteNonQueryAsync(cancellationToken);
@@ -61,7 +61,7 @@ public class TenantDbConnectionInterceptor : DbConnectionInterceptor
         base.ConnectionOpened(connection, eventData);
 
         var tenantId = _tenantAccessor.MultiTenantContext?.TenantInfo?.Identifier;
-        
+
         if (string.IsNullOrWhiteSpace(tenantId))
         {
             _logger.LogWarning("No tenant context available for database connection");
@@ -72,7 +72,7 @@ public class TenantDbConnectionInterceptor : DbConnectionInterceptor
         {
             using var command = npgsqlConnection.CreateCommand();
             command.CommandText = $"SET LOCAL app.current_tenant_id = '{tenantId}'";
-            
+
             try
             {
                 command.ExecuteNonQuery();