Add full language extraction and integrate with CI workflow

[Q2297045667]

Summary

This PR adds full multi-language translation extraction, Fabric i18n support, CI/CD, code quality improvements,

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Changes

1. Extract all languages (Translations.kt)

Before	After
Only en_us.json via classpath	All available languages via client LanguageManager + ResourceManager

• Reflectively accesses Minecraft.getInstance().getLanguageManager().getLanguages() to discover every available language
• Loads each language via the client ResourceManager.getResourceStack() (has full assets — the dev-mapped jar only ships en_us)
• Each language written as pumpkin_extractor_output/lang/<code>_java.json
• translations.json records a summary array of all extracted language codes
• Dedicated-server fallback: extracts en_us only (the sole lang file on the data-only classpath)

2. Fabric i18n (Lang.kt + language files)

• Lang.kt — loads the mod's own en_us.json at runtime, exposes Lang.fmt(key, args...) with String.format semantics. All log strings are defined in the lang file as the single source of truth.
• en_us.json / zh_cn.json — 16 translation keys each, covering mod metadata and every log message
• fabric.mod.json — name and description now reference translation keys; Fabric Loader resolves them per the player's locale

3. CI/CD (.github/workflows/build.yml)

• Triggers on push and pull_request to master
• JDK 25 + Gradle caching
• Built artifacts uploaded as extractor-build

4. Code quality (Extractor.kt)

• Removed unused modID field and Logger import
• FileWriter switched to Kotlin .use {} for auto-close
• Output directory extracted to companion object OUTPUT_DIR
• Subdirectory support via Files.createDirectories(out.parent)
• Outer try/catch(Throwable) prevents silent fatal failures
• Output-directory failure logged as error instead of info
• Dead-code comment block indentation verified identical to UP branch

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File overview

File	Status	Description
.github/workflows/build.yml	Added	CI build & artifact upload
Lang.kt	Added	i18n string loader + formatter
assets/extractor/lang/en_us.json	Added	English translations (16 keys)
assets/extractor/lang/zh_cn.json	Added	Chinese translations (16 keys)
Extractor.kt	Modified	Log i18n, .use {}, defensive error handling
Translations.kt	Modified	Multi-language extraction with client reflection
fabric.mod.json	Modified	Translation-key names
README.md	Modified	Updated extractor list

Output structure

pumpkin_extractor_output/
├── translations.json
├── lang/
│   ├── en_us_java.json
│   ├── zh_cn_java.json
│   ├── ja_jp_java.json
│   └── ...
├── blocks.json
├── items.json
└── ...

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