feat(installer): multi-language installer (EN / JA / RU / ZH / KO)

[mkpoli]

Adds a language picker to the setup wizard — five languages, all using Inno Setup's official bundled .isl files (no vendored translations):

language	source
English / Japanese / Russian	compiler:Default.isl / compiler:Languages\*.isl
Chinese (Simplified)	compiler:Languages\ChineseSimplified.isl
Korean	compiler:Languages\Korean.isl

• Chinese & Korean were promoted from "unofficial" to official in Inno Setup 6.5.0, so they no longer need vendoring — requires ISCC ≥ 6.5.0 on the build runner (the choco install innosetup default is 6.5.x).
• The final-page instruction (switch input via Win+Space, type romaji) is translated per language.
• The .iss carries a UTF-8 BOM so Inno reads its non-ASCII messages as UTF-8.

Ainu (Aynu itak) is a separate, attested-only locale in #37 (stacked on this PR).

⚠️ Needs a Windows build to verify the Inno compile — ISCC can't run locally; the installer is only compiled by the release workflow, not PR CI.

[coderabbitai]

📝 Walkthrough

Walkthrough

The installer script now prompts for a setup language, declares five supported locales, and replaces the shared finish text with localized per-language labels. The script file also includes a UTF-8 BOM prefix.

Changes

Installer localization

Layer / File(s)	Summary
Script header and language setup installer/ainuKey.iss	Adds a UTF-8 BOM, enables ShowLanguageDialog, and declares English, Japanese, Russian, Simplified Chinese, and Korean installer languages with their message files.
Localized finish labels installer/ainuKey.iss	Replaces the single final-page instruction with per-language FinishedLabel strings.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

૮⸝⸝> ᗜ <⸝⸝ა I hop through menus bright and new,
five tongues now greet the setup view.
I nibble romaji, quick and neat,
then finish labels sound complete.
Hooray—this bunny packs with cheer!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarizes the main change: adding multi-language installer support for the listed locales.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/installer-i18n

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@installer/ainuKey.iss`:
- Around line 39-48: The installer language list in ainuKey.iss assumes
ChineseSimplified.isl and Korean.isl are present in the stock Inno Setup
install, but they may be missing on a clean runner. Update the [Languages]
entries to point to bundled .isl files for the affected locales, and keep the
existing English/Japanese/Russian entries as-is so the installer can build
reliably. Use the Language names in the [Languages] section as the place to wire
in the bundled message files.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 06c2f7ec-5e9f-4434-9d6d-f0fb43215f4e

📥 Commits

Reviewing files that changed from the base of the PR and between 2dbb794 and 156d71b.

📒 Files selected for processing (1)

• installer/ainuKey.iss