docs(readme): clarify product, AI, WebMCP and PWA capabilities

[chaxus]

Summary

The README mixes the product introduction with a long technical manual and obscures optional AI, agent and PWA capabilities. Give readers a concise product overview across all eight languages: open-source positioning, a two-paragraph introduction covering the full core capability set, six user benefits, direct editor shortcuts and supported formats.

The six benefits cover local editing/conversion, saving/recovery, AI assistance (Experimental Beta), WebMCP agent tools, PWA installation with cached offline resources, and self-hosting/embedding. Briefly surface multilingual interfaces, themes and read-only preview; include local/custom AI services and browser speech input in the later AI section. Preserve the four existing demo videos, upstream acknowledgements and legal text.

Design Decisions

Use plain text titles, ordinary Markdown and native expandable sections. Display edit.chaxus.com explicitly in the live CTA and remove the redundant source CTA. Localize help-page links where the site provides that language. Move technical instructions into docs/reference.md. Keep the detailed AI demos later in the page, with Beta and default-off wording. Replace the duplicate quick-start link row with direct new-document, spreadsheet and presentation links.

Use task-oriented copy informed by the official Excalidraw, AFFiNE and Open WebUI READMEs, without adopting their long feature lists or promotional claims.

Risk Analysis

Documentation only. Make browser-agent ownership of returned content explicit. Preserve offline prerequisites, recovery retention, optional AI data handling and WebMCP browser requirements. Direct WebMCP full-text reading is limited to word-processing documents; document this in the overview and technical guide.

Verification

• 56 README locale and branding/notice tests passed on the final version.
• Repository formatting check passed; final touched-file formatting and git diff --check passed.
• Final actual GitHub Chinese preview checked at 375px and 320px: no page overflow, no title images, live URL visible and no redundant source CTA. All eight intros include Word/Excel/PowerPoint/PDF, AI Beta, WebMCP and PWA.
• Local Markdown links, the WebMCP anchor, editor shortcuts and all eight language switchers verified.
• GitHub loaded all four native demo videos without media errors; their attachment URLs and legal text are preserved.
• Remote tree matches the verified local commit tree.

Code Concerns

No blocking documentation findings.

Merge Verdict

Ready for review; hosted checks are running on the latest revision.

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