Fix admin route access and backend configuration

- Added /admin redirect to login page in nginx config
- Fixed backend server.js route ordering for proper admin handling
- Updated authentication middleware and routes
- Added user management routes
- Configured PostgreSQL integration
- Updated environment configuration

Services/MongoDBService.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using MongoDB.Bson;
+using MongoDB.Driver;
+
+namespace SkyArtShop.Services;
+
+public class MongoDBService
+{
+	private readonly IMongoDatabase _database;
+
+	private readonly MongoDBSettings _settings;
+
+	public MongoDBService(IOptions<MongoDBSettings> settings)
+	{
+		_settings = settings.Value;
+		MongoClientSettings mongoClientSettings = MongoClientSettings.FromConnectionString(_settings.ConnectionString);
+		mongoClientSettings.MaxConnectionPoolSize = 500;
+		mongoClientSettings.MinConnectionPoolSize = 50;
+		mongoClientSettings.WaitQueueTimeout = TimeSpan.FromSeconds(30.0);
+		mongoClientSettings.ServerSelectionTimeout = TimeSpan.FromSeconds(10.0);
+		mongoClientSettings.ConnectTimeout = TimeSpan.FromSeconds(10.0);
+		mongoClientSettings.SocketTimeout = TimeSpan.FromSeconds(60.0);
+		MongoClient mongoClient = new MongoClient(mongoClientSettings);
+		_database = mongoClient.GetDatabase(_settings.DatabaseName);
+	}
+
+	public IMongoCollection<T> GetCollection<T>(string collectionName)
+	{
+		return _database.GetCollection<T>(collectionName);
+	}
+
+	public async Task<List<T>> GetAllAsync<T>(string collectionName)
+	{
+		IMongoCollection<T> collection = GetCollection<T>(collectionName);
+		return await collection.Find((T _) => true).ToListAsync();
+	}
+
+	public async Task<T> GetByIdAsync<T>(string collectionName, string id)
+	{
+		IMongoCollection<T> collection = GetCollection<T>(collectionName);
+		FilterDefinition<T> filter = Builders<T>.Filter.Eq("_id", ObjectId.Parse(id));
+		return await collection.Find(filter).FirstOrDefaultAsync();
+	}
+
+	public async Task InsertAsync<T>(string collectionName, T document)
+	{
+		IMongoCollection<T> collection = GetCollection<T>(collectionName);
+		await collection.InsertOneAsync(document);
+	}
+
+	public async Task UpdateAsync<T>(string collectionName, string id, T document)
+	{
+		IMongoCollection<T> collection = GetCollection<T>(collectionName);
+		FilterDefinition<T> filter = Builders<T>.Filter.Eq("_id", ObjectId.Parse(id));
+		await collection.ReplaceOneAsync(filter, document);
+	}
+
+	public async Task DeleteAsync<T>(string collectionName, string id)
+	{
+		IMongoCollection<T> collection = GetCollection<T>(collectionName);
+		FilterDefinition<T> filter = Builders<T>.Filter.Eq("_id", ObjectId.Parse(id));
+		await collection.DeleteOneAsync(filter);
+	}
+}