feat: Add DatabaseManager and LinkPlayer components, implement authentication and linking logic

- Created DatabaseManager component for managing database access via phpMyAdmin.
- Developed LinkPlayer component to link Discord accounts with game characters, including user authentication and error handling.
- Added mock data files for players, organizations, and projects to handle backend unavailability.
- Implemented AuthService for managing user authentication and session checks.
- Created DatabaseService to fetch and manage player, organization, and project data with fallback to mock data.
- Added HTML page for handling authentication unavailability.
- Developed a test script for validating Docker setup and required files.

components/IconSet.tsx

@@ -43,6 +43,9 @@ export const Icons = {
   ),
   Hammer: ({ className }: { className?: string }) => (
     <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={className}><path d="m15 12-8.5 8.5c-.83.83-2.17.83-3 0 0 0 0 0 0 0a2.12 2.12 0 0 1 0-3L12 9"/><path d="M17.64 15 22 10.64"/><path d="m20.91 11.7-1.25-1.25c-.6-.6-.93-1.4-.93-2.25V7.86c0-.55-.45-1-1-1H16.4c-.84 0-1.65-.33-2.25-.93L12.9 4.68c-.6-.6-1.4-.93-2.25-.93H4.86c-.55 0-1 .45-1 1v1.36c0 .84.33 1.65.93 2.25L12 15.64"/></svg>
+  ),
+  Edit: ({ className }: { className?: string }) => (
+    <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" className={className}><path d="M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7"/><path d="M18.5 2.5a2.121 2.121 0 0 1 3 3L12 15l-4 1 1-4 9.5-9.5z"/></svg>
   )
 };