Integrate ai.card Rust API with ai.gpt MCP and implement daily limit system

### Major Changes:
- **Rust Migration**: Move api-rs to root directory, rename binary to 'aicard'
- **MCP Integration**: Add card tools to ai.gpt MCP server (get_user_cards, draw_card, get_draw_status)
- **Daily Limit System**: Implement 2-day interval card drawing limits in API and iOS
- **iOS Enhancements**: Add DrawStatusView, backup functionality, and limit integration

### Technical Details:
- ai.gpt MCP now has 20 tools including 3 card-related tools
- ServiceClient enhanced with missing card API methods
- iOS app includes daily limit UI and atproto OAuth backup features
- Database migration for last_draw_date field
- Complete feature parity between web and iOS implementations

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

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

api/alembic/versions/001_add_last_draw_date.py

@@ -0,0 +1,26 @@
+"""Add last_draw_date to users table
+
+Revision ID: 001_add_last_draw_date
+Revises: 
+Create Date: 2025-06-08 12:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision: str = '001_add_last_draw_date'
+down_revision: Union[str, None] = None
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Add last_draw_date column to users table for daily draw limits"""
+    op.add_column('users', sa.Column('last_draw_date', sa.DateTime(), nullable=True))
+
+
+def downgrade() -> None:
+    """Remove last_draw_date column from users table"""
+    op.drop_column('users', 'last_draw_date')