Implement all remaining blackjack service functionality

[alt-potato]

still need to write more tests but i'm tired i wanna go to sleep

[github-actions]

Formatting Issues Detected!

• Backend (Csharpier): Please run dotnet csharpier format . to fix formatting.

View Csharpier output

Error ./Project.App/Project.Api/Repositories/UserRepository.cs - Was not formatted.
  ----------------------------- Expected: Around Line 52 -----------------------------
  
          // Update user balance
          public async Task UpdateBalanceAsync(User user)
  ----------------------------- Actual: Around Line 52 -----------------------------
  
          // Update user balance·
          public async Task UpdateBalanceAsync(User user)
  
Checked 78 files in 783ms.

[github-actions]

Formatting Issues Detected!

• Backend (Csharpier): Please run dotnet csharpier format . to fix formatting.

View Csharpier output

Error ./Project.App/Project.Api/Repositories/UserRepository.cs - Was not formatted.
  ----------------------------- Expected: Around Line 52 -----------------------------
  
          // Update user balance
          public async Task UpdateBalanceAsync(User user)
  ----------------------------- Actual: Around Line 52 -----------------------------
  
          // Update user balance·
          public async Task UpdateBalanceAsync(User user)
  
Checked 81 files in 813ms.

[github-actions]

Formatting Issues Detected!

• Backend (Csharpier): Please run dotnet csharpier format . to fix formatting.

View Csharpier output

Error ./Project.App/Project.Api/Repositories/UserRepository.cs - Was not formatted.
  ----------------------------- Expected: Around Line 52 -----------------------------
  
          // Update user balance
          public async Task UpdateBalanceAsync(User user)
  ----------------------------- Actual: Around Line 52 -----------------------------
  
          // Update user balance·
          public async Task UpdateBalanceAsync(User user)
  
Checked 81 files in 739ms.

[muhiddinkurbonov]

excellent!