refactor(constants): extract configuration data to dedicated files

[wqnmlgb151]

Summary

Split the 271-line constants.dart into 9 logical sub-files under lib/constants/. The original file becomes a barrel re-export so all 23 callers continue to work without import changes.

constants.dart (271 lines → 9 lines of exports)
├── style.dart         — StyleString, LayoutBreakpoint, theme constants
├── http_client.dart   — userAgentsList, acceptLanguageList, bangumiHTTPHeader
├── syncplay.dart      — defaultSyncPlayEndPoints
├── decoders.dart      — hardwareDecodersList, androidVideoRenderersList
├── shaders.dart       — mpvAnime4KShaders, mpvAnime4KShadersLite
├── playback.dart      — defaultPlaySpeedList, aspectRatioTypeMap, playerLogLevelMap
├── danmaku_svg.dart   — danmakuOnSvg
├── anime_tags.dart    — defaultAnimeTags
└── shortcuts.dart     — defaultShortcuts, keyAliases, shortcutsChineseName

No behavior changes, no new dependencies.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Pure mechanical refactor: lib/utils/constants.dart is split into 9 dedicated files under lib/constants/, with the original file reduced to a barrel of export statements. All public symbols from the original file are preserved 1:1 across the new files and re-exported, so the 23 existing callers keep working unchanged. Required imports are correctly carried over (style.dart → Flutter material/cupertino; http_client.dart → api_endpoints). The only non-structural changes are cosmetic whitespace reformatting of a few list literals; no values, logic, or behavior changed.

Files Reviewed (10 files)

• lib/constants/anime_tags.dart
• lib/constants/danmaku_svg.dart
• lib/constants/decoders.dart
• lib/constants/http_client.dart
• lib/constants/playback.dart
• lib/constants/shaders.dart
• lib/constants/shortcuts.dart
• lib/constants/style.dart
• lib/constants/syncplay.dart
• lib/utils/constants.dart

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_{Reviewed by claude-4.8-opus-20260528 · Input: 4.3K · Output: 5.2K · Cached: 246.8K}