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/articles/getting-started.md

@@ -1,31 +1,31 @@
-# Getting Started
-
-## Prerequisites
-
-- [.NET 10 SDK](https://dotnet.microsoft.com/download)
-
-## Run the Server
-
-```bash
-dotnet run --project src/EchoHub.Server
-```
-
-On first run, the server automatically:
-
-1. Creates `appsettings.json` from the example config
-2. Generates a secure JWT secret
-3. Creates the SQLite database with a `#general` channel
-
-## Run the Client
-
-```bash
-dotnet run --project src/EchoHub.Client
-```
-
-Connect to a server, register an account, and start chatting.
-
-## Build from Source
-
-```bash
-dotnet build src/EchoHub.slnx
-```
+# Getting Started
+
+## Prerequisites
+
+- [.NET 10 SDK](https://dotnet.microsoft.com/download)
+
+## Run the Server
+
+```bash
+dotnet run --project src/EchoHub.Server
+```
+
+On first run, the server automatically:
+
+1. Creates `appsettings.json` from the example config
+2. Generates a secure JWT secret
+3. Creates the SQLite database with a `#general` channel
+
+## Run the Client
+
+```bash
+dotnet run --project src/EchoHub.Client
+```
+
+Connect to a server, register an account, and start chatting.
+
+## Build from Source
+
+```bash
+dotnet build src/EchoHub.slnx
+```