Implement LLM provider configuration and update user settings

- Added functionality to update the default LLM provider for users via a new endpoint in UserController.
- Introduced LlmProvider enum to manage available LLM options: Auto, Gemini, OpenAI, and Claude.
- Updated User and UserEntity models to include DefaultLlmProvider property.
- Enhanced database context and migrations to support the new LLM provider configuration.
- Integrated LLM services into the application bootstrap for dependency injection.
- Updated TypeScript API client to include methods for managing LLM providers and chat requests.

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

@@ -146,6 +146,7 @@ public static class PostgreSqlMappers
             SignalAgreementThreshold = entity.SignalAgreementThreshold,
             AllowSignalTrendOverride = entity.AllowSignalTrendOverride,
             DefaultExchange = entity.DefaultExchange,
+            DefaultLlmProvider = entity.DefaultLlmProvider,
             Accounts = entity.Accounts?.Select(MapAccountWithoutUser).ToList() ?? new List<Account>()
         };
     }
@@ -193,7 +194,8 @@ public static class PostgreSqlMappers
             TrendStrongAgreementThreshold = user.TrendStrongAgreementThreshold,
             SignalAgreementThreshold = user.SignalAgreementThreshold,
             AllowSignalTrendOverride = user.AllowSignalTrendOverride,
-            DefaultExchange = user.DefaultExchange
+            DefaultExchange = user.DefaultExchange,
+            DefaultLlmProvider = user.DefaultLlmProvider
         };
     }