feat: add reading from .env file

Endpoint/EnvironmentManager.cs

@@ -0,0 +1,24 @@
+using System;
+using System.IO;
+
+namespace Mirea.Api.Endpoint;
+
+internal static class EnvironmentManager
+{
+    public static void LoadEnvironment(string filePath)
+    {
+        if (!File.Exists(filePath)) return;
+
+        foreach (var line in File.ReadAllLines(filePath))
+        {
+            var parts = line.Split(
+                '=',
+                StringSplitOptions.RemoveEmptyEntries);
+
+            if (parts.Length != 2)
+                continue;
+
+            Environment.SetEnvironmentVariable(parts[0].Trim(), parts[1][..(parts[1].Contains('#') ? parts[1].IndexOf('#') : parts[1].Length)].Trim());
+        }
+    }
+}