feat: fetch ability tree and map data from Wynncraft API

[DevScyu]

Adds automation for ability tree data that was previously maintained manually.

• update_ability_data.sh: fetches /ability/tree/{class} and /ability/map/{class} for each class, saves raw files, calls the existing merge_abilities.sh, and produces a new Reference/ability_map.json
• update_ability_data.yml: runs the above hourly
• Saves /v3/classes response to Reference/classes.json since we fetch it anyway
• Adds wynn-openapi.yml and a daily workflow to keep it in sync with docs.wynncraft.com

---

⚠️ Blocked on mod update — API schema has changed

The Wynncraft API has changed the structure of /ability/tree/{class}. The generated files in this PR reflect the new format. The mod currently cannot consume them.

Old format (what the mod expects):

{
  "nodes": [{ "id": 1, "name": "Arrow Bomb", "description": ["§6..."], "location": {...}, "connections": [...] }],
  "archetypeInfoMap": { "Boltslinger": {...} }
}

New format (what the API now returns):

{
  "archetypes": { "boltslinger": { "description": "<span ...>", "icon": {...} } },
  "pages": { "1": { "arrowbomb": { "coordinates": {"x": 7, "y": 3}, "description": ["<span ...>"] } } }
}

What needs updating in the mod:

• AbilityTreeInfo.java — currently record AbilityTreeInfo(List<AbilityTreeSkillNode> nodes), needs to reflect pages + archetypes top-level keys
• AbilityTreeSkillNode.java — fields like id, formattedName, location, connections no longer exist; replaced by ability ID as map key, coordinates, HTML description
• AbilityTreeModel.java — deserialisation type changes accordingly
• AbilityTreeParser.java and UnprocessedAbilityTreeInfo.java — downstream consumers that will need updating

Do not merge until the mod is updated to consume the new schema.

[ShadowCat117]

We never bothered using the API for the ability data as we can quite easily extract it from in-game which is often more updated than the API and we have more control over the format.

Since no work has been done on needing the data it's currently very outdated and the parsing doesn't even work but I did fix it locally a few months ago and had a v2 of the json ShadowCat117@750d4a7 it just needed a mod update to implement it which I never did