Change pre_release to Object and pack_id_table to inverse mapping Object

[Copilot]

pre_release was unnecessarily wrapped in a Map, and pack_id_table was derived as a Map via inverse_mapping(). Both are converted to plain Objects, consistent with how pack_list is used elsewhere.

Changes

• ygo-json-loader.mjs

  • pre_release: export raw JSON import directly instead of new Map(Object.entries(pre_table))
  • pack_id_table: replace inverse_mapping(pre_release) with Object.fromEntries-based inversion → plain {[id: number]: string} Object
  • pack_id_table.get(pack_id) → pack_id_table[pack_id]

• ygo-query.mjs

  • pre_release.has(params.pack) → Object.hasOwn(pre_release, params.pack) (×2)
  • pre_release.get(params.pack) → pre_release[params.pack] (×2)

// Before
export const pre_release = new Map(Object.entries(pre_table));
const pack_id_table = inverse_mapping(pre_release); // Map<number, string>

// After
export const pre_release = pre_table; // plain Object
const pack_id_table = Object.fromEntries(Object.entries(pre_release).map(([k, v]) => [v, k]));

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