docs: fix Manual Edit protocol summaries to match implemented contracts

[xxiaoxiong]

Summary

This PR fixes two stale protocol summary lines in specs/current/manual-edit-direct-manipulation.zh-CN.md that contradict the live implementation (issue #6141, labeled good first issue + help wanted).

Changes

1. od-edit-paste-image payload (v2.3 summary)

   • Before: {id, file}
   • After: {id, name, mime, buffer}
   • The bridge and typed host contract already use {id, name, mime, buffer} because the clipboard/drag File handle may be neutered after the event turn, so bytes must cross the iframe boundary.

2. od-edit-apply-dom operations (v2.4 summary)

   • Before: replace|insert-after|append-child|prepend-child|remove
   • After: replace|insert-after|insert-at-index|append-child|prepend-child|remove|apply-content
   • insert-at-index is used to restore a removed body child at its original index; apply-content mirrors edits for runtime-annotated brand targets without reloading the iframe.

Scope

Pure documentation fix (2 lines changed). No runtime code changes needed. The implementation already matches the corrected contracts.

[lefarcen]

Thanks @xxiaoxiong — these two corrections look on point. The {id, file} → {id, name, mime, buffer} fix for od-edit-paste-image and the added insert-at-index / apply-content ops in the od-edit-apply-dom summary both match what the bridge and host contracts actually implement. Assigning @mrcfps for review.

[mrcfps]

@xxiaoxiong Thanks for the clean docs fix on a good-first-issue — appreciated!

I verified the two protocol summary updates in specs/current/manual-edit-direct-manipulation.zh-CN.md:

1. v2.3 od-edit-paste-image summary now uses {id, name, mime, buffer}, matching the detailed section just above (line 78) and the historical typed bridge contract (ManualEditPasteImageMessage / byte payload for clipboard and drag Files).
2. v2.4 od-edit-apply-dom summary now includes insert-at-index and apply-content, matching the surrounding architecture prose (brand runtime targets / body-child restore) and the host applyManualEditDomOp op union.

Pure documentation change, internally consistent, no runtime risk. Nice surgical fix.

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