docs(site): [SITE-04] document Canvas and Mediabunny proxies

refactor/plan.md

@@ -687,7 +687,7 @@
 - SITE-DANMUKU-01: [记录](changes/2026-09-15-SITE-DANMUKU-01-guides.md) [记录](baselines/danmuku-docs-validation.json)
 - SITE-HLS-01: [记录](changes/2026-09-15-SITE-HLS-01-guides.md) [记录](baselines/hls-docs-validation.json)
 - SITE-DASH-01: [记录](changes/2026-09-15-SITE-DASH-01-guides.md) [记录](baselines/dash-docs-validation.json)
-- SITE-04: [记录](site-content-review.md) [记录](changes/2026-09-16-SITE-04-chapter-ambilight-guides.md) [记录](baselines/site04-chapter-ambilight-guides.json) [记录](changes/2026-09-16-SITE-04-dpip-asr-guides.md) [记录](baselines/site04-dpip-asr-guides.json) [记录](changes/2026-09-16-SITE-04-auto-multi-guides.md) [记录](baselines/site04-auto-multi-guides.json) [记录](changes/2026-09-16-SITE-04-ads-vast-guides.md) [记录](baselines/site04-ads-vast-guides.json) [记录](changes/2026-09-16-SITE-04-jassub-mask-cast-guides.md) [记录](baselines/site04-jassub-mask-cast-guides.json) [记录](changes/2026-09-16-SITE-04-tools-guides.md) [记录](baselines/site04-tools-guides.json)
+- SITE-04: [记录](site-content-review.md) [记录](changes/2026-09-16-SITE-04-chapter-ambilight-guides.md) [记录](baselines/site04-chapter-ambilight-guides.json) [记录](changes/2026-09-16-SITE-04-dpip-asr-guides.md) [记录](baselines/site04-dpip-asr-guides.json) [记录](changes/2026-09-16-SITE-04-auto-multi-guides.md) [记录](baselines/site04-auto-multi-guides.json) [记录](changes/2026-09-16-SITE-04-ads-vast-guides.md) [记录](baselines/site04-ads-vast-guides.json) [记录](changes/2026-09-16-SITE-04-jassub-mask-cast-guides.md) [记录](baselines/site04-jassub-mask-cast-guides.json) [记录](changes/2026-09-16-SITE-04-tools-guides.md) [记录](baselines/site04-tools-guides.json) [记录](changes/2026-09-16-SITE-04-proxies-guides.md) [记录](baselines/site04-proxies-guides.json)
 - SITE-07: [记录](site-inventory.md) [记录](baselines/site-provenance.json) [记录](changes/2026-09-14-SITE-07-vendor-notices.md) [记录](baselines/site-notices-checkpoint.json) [记录](baselines/site-codicons-provenance.json) [记录](baselines/site-codicons-validation.json) [记录](changes/2026-09-15-SITE-07-codicons.md) [记录](baselines/vconsole-notices-provenance.json) [记录](baselines/vconsole-notices-validation.json) [记录](changes/2026-09-15-SITE-07-vconsole-notices.md) [记录](console-modernization.md) [记录](baselines/site-console-inventory.json) [记录](baselines/site-console-validation.json) [记录](changes/2026-09-15-SITE-07-console-baseline.md) [记录](baselines/console-feed-provenance.json) [记录](changes/2026-09-15-SITE-07-console-feed-source.md) [记录](baselines/console-commonjs-provenance.json) [记录](changes/2026-09-15-SITE-07-console-commonjs.md) [记录](baselines/console-esm-provenance.json) [记录](changes/2026-09-15-SITE-07-console-esm.md) [记录](baselines/console-embedded-notices.json) [记录](baselines/console-notices-validation.json) [记录](changes/2026-09-15-SITE-07-console-notices.md) [记录](baselines/console-embedded-sources.json) [记录](baselines/console-embedded-validation.json) [记录](changes/2026-09-15-SITE-07-console-embedded-sources.md) [记录](baselines/console-derived-attribution.json) [记录](baselines/console-derived-validation.json) [记录](changes/2026-09-15-SITE-07-console-derived-attribution.md) [记录](baselines/console-stackoverflow-provenance.json) [记录](baselines/console-stackoverflow-validation.json) [记录](changes/2026-09-15-SITE-07-console-stackoverflow.md) [记录](baselines/console-shallowequal-validation.json) [记录](changes/2026-09-15-SITE-07-console-shallowequal.md) [记录](console-notice-review.md) [记录](baselines/console-notice-review-validation.json) [记录](changes/2026-09-15-SITE-07-console-notice-review.md) [记录](baselines/monaco-typescript-provenance.json) [记录](baselines/monaco-typescript-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-typescript.md) [记录](baselines/monaco-languages-provenance.json) [记录](baselines/monaco-languages-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-languages.md) [记录](baselines/monaco-language-notices.json) [记录](baselines/monaco-language-notices-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-language-notices.md) [记录](baselines/monaco-modes-provenance.json) [记录](baselines/monaco-modes-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-modes.md) [记录](baselines/monaco-basic-provenance.json) [记录](baselines/monaco-basic-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-basic.md) [记录](baselines/monaco-core-origins-provenance.json) [记录](baselines/monaco-core-origins-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-core-origins.md) [记录](baselines/monaco-core-build-provenance.json) [记录](baselines/monaco-core-build-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-core-build.md) [记录](baselines/monaco-contributions-provenance.json) [记录](baselines/monaco-contributions-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-contributions.md) [记录](baselines/monaco-css-build-provenance.json) [记录](baselines/monaco-css-build-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-css.md) [记录](baselines/monaco-node-path-provenance.json) [记录](baselines/monaco-node-path-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-node-path.md) [记录](changes/2026-09-15-SITE-07-monaco-dom.md) [记录](baselines/monaco-dom-origins-validation.json) [记录](changes/2026-09-15-SITE-07-monaco-unicode.md) [记录](baselines/monaco-unicode-provenance.json) [记录](baselines/monaco-unicode-validation.json) [记录](changes/2026-09-15-SITE-07-font-notices.md) [记录](baselines/site-font-notices-provenance.json) [记录](baselines/site-font-notices-validation.json)
 - EX-01: [记录](changes/2026-09-14-EX-01-react-consumer.md) [记录](baselines/react-consumer-validation.json) [记录](scripts/react-consumer.mjs)
 - EX-02: [记录](changes/2026-09-14-EX-02-vue-consumer.md) [记录](baselines/vue-consumer-validation.json) [记录](scripts/vue-consumer.mjs)