feat(lua): migrate achievements runtime to Lua

[scarf005]

Purpose of change (The Why)

• Continue Lua migration by moving achievements runtime evaluation and UI text generation out of C++ tracker flow.

Describe the solution (The How)

• Added data/json/achievements.lua runtime, wired through data/json/preload.lua and data/json/main.lua.
• Added Lua-facing game APIs for achievement/stat/skill/kill queries in src/catalua_bindings_game.cpp and Lua UI text bridge in src/catalua.cpp/src/catalua.h.
• Redirected achievements tab rendering to Lua text in src/scores_ui.cpp; removed C++ tracker event subscription/save serialization usage in src/game.cpp and src/savegame.cpp.
• Added lua_achievements_runtime coverage in tests/catalua_test.cpp.

Describe alternatives you've considered

• Keeping the C++ tracker as the runtime authority and only mirroring to Lua; rejected to satisfy full Lua runtime migration goal.

Testing

• cmake --build build --target astyle
• cmake --build build --target style-json-parallel
• deno task dprint fmt
• cmake --preset linux-full
• cmake --build --preset linux-full --target cataclysm-bn-tiles cata_test-tiles
• ./out/build/linux-full/tests/cata_test-tiles "lua_achievements_runtime"
• ./out/build/linux-full/tests/cata_test-tiles "achievements_tracker"
• ./out/build/linux-full/src/cataclysm-bn-tiles --check-mods (fails due local external user mods unrelated to this PR)

Additional context

• No related issue linked.

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Optional

• This is a C++ PR that modifies JSON loading or behavior.
  • I have documented the changes in the appropriate location in the docs/ folder.
  • If documentation for this feature does not exist, please write it or at least note its lack in PR description.
  • New localizable fields need to be added to the lang/bn_extract_json_strings.sh script if it does not support them yet.
  • If applicable, add checks on game load that would validate the loaded data.
  • If it modifies format of save files, please add migration from the old format.
• This PR modifies lua scripts or the lua API.
  • I have added lua scope to the PR title.
  • I have added type annotations to functions so that it's safe and easy to maintain.
  • I have committed the output of deno task docs:gen so the Lua API documentation is updated.