[Localization] Full Chinese translation of messages_zh.yml #81

Summary

messages_zh.yml is only partially translated — many UI strings fall back to English. This change brings it to full coverage for the strings that actually appear in-game.

What's included

• ~130 live keys translated to Chinese — every key referenced by a {translate:...} macro in config.yml, stock-gui.yml and shop.yml:
  • sign shop ([商店] / [玩家商店], buy/sell lines, 缺货, 不可用)
  • shop menu + all 13 categories (titles, icons, lore, item lines)
  • stock market GUI (overview, filters, pagination, blocked/frozen markers)
  • daily rotations (每日特惠 farming/monster/miner)
  • command feedback (reload-*, stock-admin.*, hook permission message)
• Missing live keys added — commands.reload-no-permission/reload-success/reload-failed, commands.stock-admin.* (8 keys), shop.categories.food.item-note, shop.categories.valuables.experience-bottle-display-name, and the stock-GUI localization keys.
• Structural fixes (see linked bug report): shop.shop.rotations → shop.rotations, see-all.lore list → line1/line2 map.

Scope note

Only strings that flow through the message system were translated. Java-hardcoded strings (e.g. PlayerShopMessages defaults, setup-shop GUI) are intentionally left untouched.