feat: use session localization git submodule

[Aerilym]

No description provided.

[Copilot]

Pull request overview

This PR updates the project to use a git submodule for session localization instead of maintaining localization files directly in the repository. The change introduces a new submodule at run/localizer/lib and updates the Node.js version requirement from 18 to 24.

Key Changes:

• Replaced inline localization files with a git submodule reference
• Updated Node.js version from 18 to 24 across configuration files
• Modified GitHub Actions workflows to checkout submodules recursively

Reviewed changes

Copilot reviewed 16 out of 18 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
run/localizer/locales.ts	Removed entire localization dictionary file (5675 lines) to be replaced by submodule
run/localizer/lib	Added git submodule reference pointing to session-foundation/session-localization repository
run/localizer/englishStrippedStr.ts	Updated import to reference localization from the new submodule lib
run/localizer/constants.ts	Removed constants file (likely moved to submodule)
run/localizer/Localizer.ts	Removed localization utility file (512 lines, likely moved to submodule)
package.json	Updated @types/node from ^20.14.10 to 24 and node engine requirement from >=18 to >=24
yarn.lock	Updated @types/node and undici-types dependency versions to align with Node.js 24
.tool-versions	Added file specifying node 24.12.0
.nvmrc	Updated Node.js version from 18.15.0 to 24.12.0
.mise.toml	Added configuration file specifying yarn version 4
.gitmodules	Added submodule configuration for session-localization
README.md	Updated setup instructions to include git lfs and submodule initialization steps
.github/workflows/*.yml	Added submodules: 'recursive' to all checkout actions in workflow files

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