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.

.github/ISSUE_TEMPLATE/config.yml

@@ -1,5 +1,5 @@
-blank_issues_enabled: true
-contact_links:
-  - name: Security policy
-    url: https://github.com/HueByte/EchoHub/security/policy
-    about: Please report security vulnerabilities here (or see SECURITY.md).
+blank_issues_enabled: true
+contact_links:
+  - name: Security policy
+    url: https://github.com/HueByte/EchoHub/security/policy
+    about: Please report security vulnerabilities here (or see SECURITY.md).