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.Server/Controllers/ServerController.cs

@@ -1,26 +1,26 @@
-using EchoHub.Core.DTOs;
-using EchoHub.Server.Data;
-using Microsoft.AspNetCore.Mvc;
-using Microsoft.EntityFrameworkCore;
-
-namespace EchoHub.Server.Controllers;
-
-[ApiController]
-[Route("api/server")]
-public class ServerController(EchoHubDbContext db, IConfiguration config) : ControllerBase
-{
-    [HttpGet("info")]
-    public async Task<IActionResult> GetInfo()
-    {
-        var userCount = await db.Users.CountAsync();
-        var channelCount = await db.Channels.CountAsync();
-
-        var status = new ServerStatusDto(
-            config["Server:Name"] ?? "EchoHub Server",
-            config["Server:Description"],
-            userCount,
-            channelCount);
-
-        return Ok(status);
-    }
-}
+using EchoHub.Core.DTOs;
+using EchoHub.Server.Data;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace EchoHub.Server.Controllers;
+
+[ApiController]
+[Route("api/server")]
+public class ServerController(EchoHubDbContext db, IConfiguration config) : ControllerBase
+{
+    [HttpGet("info")]
+    public async Task<IActionResult> GetInfo()
+    {
+        var userCount = await db.Users.CountAsync();
+        var channelCount = await db.Channels.CountAsync();
+
+        var status = new ServerStatusDto(
+            config["Server:Name"] ?? "EchoHub Server",
+            config["Server:Description"],
+            userCount,
+            channelCount);
+
+        return Ok(status);
+    }
+}