Add Ogg audio decoder fallback

[han4wluc]

Summary

• Add lazy Ogg Vorbis/Opus decoder fallback support when native browser decoding fails.
• Build RouteGraphics as split ESM chunks and serve /dist/chunks from render/CLI servers for lazy decoder imports.
• Extend audio asset tests for decode caching, decoder preparation, native-support skip, and MIME type forwarding.

Tests

• bun run lint
• bun run build
• bun run test spec/audio/audioAsset.spec.js
• bun run test spec/RouteGraphics.publicApi.spec.js spec/audio/audioAsset.spec.js
• Pre-push hook: vitest run (72 files, 467 tests)