Add project files

StalwartSimpleLoginMiddleware/Repositories/ApiKeyContextRepository.cs

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+using AspNetCore.Authentication.ApiKey;
+using Microsoft.EntityFrameworkCore;
+using StalwartSimpleLoginMiddleware.Contexts;
+using StalwartSimpleLoginMiddleware.Models;
+using StalwartSimpleLoginMiddleware.Utilities;
+
+namespace StalwartSimpleLoginMiddleware.Repositories;
+
+public class ApiKeyContextRepository(ApiKeyContext context) : IApiKeyRepository
+{
+    public async Task<IApiKey?> GetApiKeyAsync(string key)
+    {
+        var dbKey = await context.ApiKeys.AsNoTracking()
+            .FirstOrDefaultAsync(api => api.Key == key);
+        if (dbKey == null) return null;
+
+        return ApiKeyHelper.CreateDbApiKey(dbKey);
+    }
+
+    public async Task<KeyMetadata> GetMetadataAsync(string key)
+    {
+        var dbKey = await context.ApiKeys.AsNoTracking()
+            .Include(api => api.Members)
+            .FirstAsync(api => api.Key == key);
+
+        return ApiKeyHelper.CreateKeyMetadata(dbKey);
+    }
+}

StalwartSimpleLoginMiddleware/Repositories/IApiKeyRepository.cs

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+using AspNetCore.Authentication.ApiKey;
+using StalwartSimpleLoginMiddleware.Models;
+
+namespace StalwartSimpleLoginMiddleware.Repositories;
+
+public interface IApiKeyRepository
+{
+    Task<IApiKey?> GetApiKeyAsync(string key);
+    Task<KeyMetadata> GetMetadataAsync(string key);
+}