docs: pricing audit — version tips, resource limits, and notification quotas

[ysyneu]

Summary

• Add unified version requirement tips to 24 feature doc pages (zh + en) covering Standard+ and Pro+ gated features, using a consistent <Tip> component style
• Expand pricing page with resource limits, notification quotas (with silent-drop warnings), customer support levels, RUM data retention, On-Premises details, and trial FAQ
• Fix tier naming: "商业版" → "专业版" for consistency with code and external pricing page
• Standardize existing post-mortem <Note> version markers to the unified <Tip> style
• Simplify drop rules steps, audit log notes, and team-members invite wording (from prior commits on this branch)

Test plan

• mint broken-links passes (only known README_zh.md cross-ref)
• Visual review of pricing page tables (resource limits, notification quotas, support levels)
• Spot-check version tips render correctly on feature pages (e.g., noise-reduction, war-room, Slack integration)
• Verify zh/en parity for all new content

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