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.

test-docker-setup.sh

@@ -0,0 +1,93 @@
+#!/bin/bash
+
+# Test script for Docker setup
+echo "🚀 Testing Docker setup for Vollidioten project..."
+
+# Check if Docker is running
+if ! docker info > /dev/null 2>&1; then
+    echo "❌ Docker is not running. Please start Docker first."
+    exit 1
+fi
+
+# Check if Traefik network exists
+if ! docker network ls | grep -q "traefik_network"; then
+    echo "❌ Traefik network not found. Creating it..."
+    docker network create traefik_network
+    if [ $? -eq 0 ]; then
+        echo "✅ Traefik network created successfully."
+    else
+        echo "❌ Failed to create Traefik network."
+        exit 1
+    fi
+fi
+
+# Test building the containers
+echo "📦 Building Docker containers..."
+docker-compose build
+
+if [ $? -eq 0 ]; then
+    echo "✅ Docker containers built successfully."
+else
+    echo "❌ Failed to build Docker containers."
+    exit 1
+fi
+
+# Check if required files exist
+echo "📁 Checking required files..."
+required_files=(
+    "Dockerfile.frontend"
+    "Dockerfile.backend"
+    "docker-compose.yml"
+    "nginx.conf"
+    "public/mock/players.json"
+    "public/mock/orgs.json"
+    "public/mock/projects.json"
+    "public/auth-unavailable.html"
+)
+
+missing_files=()
+for file in "${required_files[@]}"; do
+    if [ ! -f "$file" ]; then
+        missing_files+=("$file")
+    fi
+done
+
+if [ ${#missing_files[@]} -eq 0 ]; then
+    echo "✅ All required files are present."
+else
+    echo "❌ Missing files:"
+    for file in "${missing_files[@]}"; do
+        echo "   - $file"
+    done
+    exit 1
+fi
+
+echo "🎉 Docker setup test completed successfully!"
+echo ""
+echo "📋 Summary:"
+echo "   - Docker is running"
+echo "   - Traefik network is available"
+echo "   - All required files are present"
+echo "   - Docker containers can be built"
+echo ""
+echo "🚀 You can now start the services with:"
+echo "   docker-compose up -d"
+echo ""
+echo "🌐 The application will be available at:"
+echo "   https://vollidioten.ceraticsoft.de"
+
+<task_progress>
+- [x] Analyze current project structure and requirements
+- [x] Examine existing docker-compose.yml
+- [x] Check backend and frontend configuration
+- [x] Create Dockerfile for frontend
+- [x] Create Dockerfile for backend
+- [x] Create nginx configuration with fallback
+- [x] Create mock data files
+- [x] Update docker-compose.yml with Traefik integration
+- [x] Implement backend fallback mechanism in frontend
+- [x] Update frontend Dockerfile to include public folder
+- [x] Create test script
+- [ ] Test the setup
+</task_progress>
+</write_to_file>