[Docs] Improve English translation quality and sync with Chinese docs

[q404365631]

Summary

This PR improves the English translation quality of the documentation and syncs it with the Chinese version, as part of the Documentation Update Bounty.

Changes

Content Sync

• Rewrite Loomy introduction (en) to match the Chinese version content structure
• Fix WeChat channel missing from AstronClaw comparison table (en introduction.md)

Translation Quality Fixes

• Fix incorrect Weibo command translation (Connect Lobster → 连接龙虾)
• Fix grammar: chat softwares → chat applications
• Fix grammar: these key information → this key information
• Improve: knowledge precipitation → knowledge retention
• Improve: Breakpoint Diagnosis → Bottleneck Diagnosis
• Improve: Hotspot Tracking → Trend Tracking
• Improve: Product Information Crawling → Product Information Extraction
• Improve homepage features descriptions (en)
• Fix Privacy and Security Related → Privacy and Security
• Fix be easier to play its value → deliver its value
• Remove unnatural currently from quick-start

Testing

• Verified all changes maintain correct Markdown formatting
• Checked that image references and links remain valid

Related: #17

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[FenjuFu]

Thanks for the PR — the translation fixes are genuinely valuable, especially catching Connect Lobster: the Weibo bot expects the literal Chinese string 连接龙虾, so the previous English rendering would have led readers to send a command that doesn't work. The Loomy introduction rewrite also matches the current Chinese version faithfully and reads much better than the old English text.

A few things need to be addressed before this can merge:

1. Please rebase — the PR currently conflicts with main

This branch predates the upstream docs sync merged on 2026-06-27 (#58), which already fixed some of the same sentences with different wording:

• docs/en/guide/loomy/scheduled-tasks.md — both lines you touched (these key information, fraudulently use → misuse) are already fixed on main. Please drop this file from the PR.
• docs/en/guide/loomy/faq.md — be easier to play its value and the API Key paragraph were already reworded on main. Only your heading fix (Privacy and Security Related → Privacy and Security) is still needed; please keep that and drop the rest.

The changes to channels.md, getting-started.md, both introduction.md files, scenarios.md, quick-start.md, and index.md are all still current on main and remain valid after a rebase.

2. 连接龙虾 — add an English gloss

The fix is correct, but English readers should know what they're sending. Suggest:

Send private message: 连接龙虾 (literally "Connect Lobster"). Get the app credentials:

3. Comparison table: WeChat addition diverges from the Chinese version

Adding WeChat is factually right — the Chinese channels.md documents a full WeChat channel guide. But the Chinese comparison table in docs/guide/astronclaw/introduction.md only lists 飞书、钉钉、企微 (not even Weibo), so this change makes the EN and ZH tables less in sync (5 channels vs 3). Please also update the Chinese table to include 微信 and 微博 so both stay consistent.

Everything else LGTM. Happy to merge once the rebase is done.