Add GetBotByUserIdAndNameAsync method to IBotService and BotService

- Implemented GetBotByUserIdAndNameAsync in IBotService and BotService to retrieve a bot by user ID and name.
- Updated GetUserStrategyCommandHandler to utilize the new method for fetching strategies based on user ID.
- Added corresponding method in IBotRepository and PostgreSqlBotRepository for database access.

src/Managing.Infrastructure.Database/PostgreSql/PostgreSqlBotRepository.cs

@@ -162,6 +162,17 @@ public class PostgreSqlBotRepository : IBotRepository
         return PostgreSqlMappers.Map(entity);
     }
 
+    public async Task<Bot> GetBotByUserIdAndNameAsync(int userId, string name)
+    {
+        var entity = await _context.Bots
+            .AsNoTracking()
+            .Include(m => m.User)
+            .Include(m => m.MasterBotUser)
+            .FirstOrDefaultAsync(b => b.UserId == userId && b.Name == name)
+            .ConfigureAwait(false);
+        return PostgreSqlMappers.Map(entity);
+    }
+
     public async Task<IEnumerable<Bot>> GetBotsByIdsAsync(IEnumerable<Guid> identifiers)
     {
         try