Add complete ai.card Rust implementation

- Implement complete Rust API server with axum framework
- Add database abstraction supporting PostgreSQL and SQLite
- Implement comprehensive gacha system with probability calculations
- Add JWT authentication with atproto DID integration
- Create card master data system with rarities (Normal, Rare, SuperRare, Kira, Unique)
- Implement draw history tracking and collection management
- Add API endpoints for authentication, card drawing, and collection viewing
- Include database migrations for both PostgreSQL and SQLite
- Maintain full compatibility with Python API implementation
- Add comprehensive documentation and development guide

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

start_server.sh

@@ -5,13 +5,13 @@ set -e
 
 # Configuration
 CARD_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
-API_DIR="$CARD_DIR/api"
+API_DIR="$CARD_DIR/python/api"
 VENV_DIR="$HOME/.config/syui/ai/card/venv"
 PYTHON="$VENV_DIR/bin/python"
 
 # Default settings
 HOST="${HOST:-localhost}"
-PORT="${PORT:-8000}"
+PORT="${PORT:-8001}"
 RELOAD="${RELOAD:-true}"
 
 echo "🎴 Starting ai.card MCP Server"