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.

docs/changelog/v0.1.0.md

@@ -1,13 +1,13 @@
-# v0.1.0 - Initial Release
-
-## Features
-
-- Real-time messaging via SignalR
-- JWT authentication with access and refresh tokens
-- Channel management (create, set topic, delete)
-- File and image uploads with magic-byte validation
-- Image-to-ASCII conversion for terminal display
-- Presence tracking (online, away, DND, invisible)
-- 6 built-in TUI themes
-- Rate limiting on auth, upload, and general endpoints
-- Self-contained binary releases for Windows, Linux, and macOS
+# v0.1.0 - Initial Release
+
+## Features
+
+- Real-time messaging via SignalR
+- JWT authentication with access and refresh tokens
+- Channel management (create, set topic, delete)
+- File and image uploads with magic-byte validation
+- Image-to-ASCII conversion for terminal display
+- Presence tracking (online, away, DND, invisible)
+- 6 built-in TUI themes
+- Rate limiting on auth, upload, and general endpoints
+- Self-contained binary releases for Windows, Linux, and macOS