Refactor and update various components of EchoHub.Server

- Updated launchSettings.json for consistency.
- Refactored FileValidationHelper to improve image validation logic.
- Enhanced ServerDirectoryService for better connection handling and user count updates.
- Improved DatabaseSetup for legacy database handling and seeding default channels.
- Refined FirstRunSetup to ensure JWT secret generation.
- Removed appsettings.Development.json as it is no longer needed.
- Updated EchoHub.Tests project file for consistency.
- Added unit tests for FileValidationHelper and PresenceTracker with improved assertions.
- Updated ValidationConstantsTests to ensure regex validations are correct.
- Cleaned up solution file formatting for better readability.

src/EchoHub.Tests/FileValidationHelperTests.cs

@@ -1,56 +1,56 @@
-using EchoHub.Server.Services;
-using Xunit;
-
-namespace EchoHub.Tests;
-
-public class FileValidationHelperTests
-{
-    [Fact]
-    public void IsValidImage_JpegMagicBytes_ReturnsTrue()
-    {
-        byte[] jpeg = [0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10];
-        using var stream = new MemoryStream(jpeg);
-        Assert.True(FileValidationHelper.IsValidImage(stream));
-    }
-
-    [Fact]
-    public void IsValidImage_PngMagicBytes_ReturnsTrue()
-    {
-        byte[] png = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
-        using var stream = new MemoryStream(png);
-        Assert.True(FileValidationHelper.IsValidImage(stream));
-    }
-
-    [Fact]
-    public void IsValidImage_GifMagicBytes_ReturnsTrue()
-    {
-        byte[] gif = [0x47, 0x49, 0x46, 0x38, 0x39, 0x61];
-        using var stream = new MemoryStream(gif);
-        Assert.True(FileValidationHelper.IsValidImage(stream));
-    }
-
-    [Fact]
-    public void IsValidImage_WebpMagicBytes_ReturnsTrue()
-    {
-        byte[] webp = [0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x45, 0x42, 0x50];
-        using var stream = new MemoryStream(webp);
-        Assert.True(FileValidationHelper.IsValidImage(stream));
-    }
-
-    [Fact]
-    public void IsValidImage_RandomBytes_ReturnsFalse()
-    {
-        byte[] random = [0x00, 0x01, 0x02, 0x03, 0x04, 0x05];
-        using var stream = new MemoryStream(random);
-        Assert.False(FileValidationHelper.IsValidImage(stream));
-    }
-
-    [Fact]
-    public void IsValidImage_ResetsStreamPosition()
-    {
-        byte[] jpeg = [0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10];
-        using var stream = new MemoryStream(jpeg);
-        FileValidationHelper.IsValidImage(stream);
-        Assert.Equal(0, stream.Position);
-    }
-}
+using EchoHub.Server.Services;
+using Xunit;
+
+namespace EchoHub.Tests;
+
+public class FileValidationHelperTests
+{
+    [Fact]
+    public void IsValidImage_JpegMagicBytes_ReturnsTrue()
+    {
+        byte[] jpeg = [0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10];
+        using var stream = new MemoryStream(jpeg);
+        Assert.True(FileValidationHelper.IsValidImage(stream));
+    }
+
+    [Fact]
+    public void IsValidImage_PngMagicBytes_ReturnsTrue()
+    {
+        byte[] png = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];
+        using var stream = new MemoryStream(png);
+        Assert.True(FileValidationHelper.IsValidImage(stream));
+    }
+
+    [Fact]
+    public void IsValidImage_GifMagicBytes_ReturnsTrue()
+    {
+        byte[] gif = [0x47, 0x49, 0x46, 0x38, 0x39, 0x61];
+        using var stream = new MemoryStream(gif);
+        Assert.True(FileValidationHelper.IsValidImage(stream));
+    }
+
+    [Fact]
+    public void IsValidImage_WebpMagicBytes_ReturnsTrue()
+    {
+        byte[] webp = [0x52, 0x49, 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, 0x57, 0x45, 0x42, 0x50];
+        using var stream = new MemoryStream(webp);
+        Assert.True(FileValidationHelper.IsValidImage(stream));
+    }
+
+    [Fact]
+    public void IsValidImage_RandomBytes_ReturnsFalse()
+    {
+        byte[] random = [0x00, 0x01, 0x02, 0x03, 0x04, 0x05];
+        using var stream = new MemoryStream(random);
+        Assert.False(FileValidationHelper.IsValidImage(stream));
+    }
+
+    [Fact]
+    public void IsValidImage_ResetsStreamPosition()
+    {
+        byte[] jpeg = [0xFF, 0xD8, 0xFF, 0xE0, 0x00, 0x10];
+        using var stream = new MemoryStream(jpeg);
+        FileValidationHelper.IsValidImage(stream);
+        Assert.Equal(0, stream.Position);
+    }
+}