Refactor code such that Card info can be loaded from an external JSON file

[KFSPC8]

Moved Card Data to a JSON file

Changes

1. Moved card definitions from inline Python to database.json:

   • The eventual goal is to make use of database.json from deckgym to save LOTS of manual importing and duplicated maintenance work

2. Enhanced card data parsing:

   • Added _parse_card_data() to convert JSON strings to Python types
   • Creates Ability instances from string names
   • Supports both numeric and list-based retreat costs (e.g., ["Colorless", "Colorless"] → 2)

3. Code cleanup:

   • Removed inline CARDS_DICT, replaced with loaded CARDS_DATA
   • Added proper type hints and docstrings
   • Improved error handling in card data loading

Technical Details

• Card loading happens when the module is imported via _load_cards()
• JSON format example:

  {
    "Pokemon": {
      "id": "A1 129",
      "name": "Mewtwo EX",
      "hp": 150,
      "energy_type": "PSYCHIC",
      "attacks": ["psydrive", "psychic_sphere"],
      "retreat_cost": ["Colorless", "Colorless"],
      ...
    }
  }

[apmnt]

Nice, sensible change. Also drives collaboration. Thanks!

[apmnt]

There could still be an option for an enum just for developer experience when building decks like this

[KFSPC8]

Understandable. Although I'm not sure what is the best way to do it without incurring maintenance effort of populating the enum. Perhaps we need a separate script to parse the json and generate the enum through a build pipeline.

[KFSPC8]

Thanks for the merge. I hope it didn't result in too much merge conflicts!