fix: sync index.html from page_asset.js — apply all text/UI fixes to master file

index.html is the master file served by Cloudflare Pages. All previous
page_asset.js edits were not reflected on the live site because index.html
was never regenerated. This sync applies ALL accumulated fixes:

- Remove all redundant text prefixes (允许融资, 策略默认, 平台默认)
- Fix pendingChangeState null guards for new accounts
- Schwab/LongBridge dca:true in platformConfig
- IBIT exit auto-set from DCA mode, remove standalone section
- Add combo strategies to fallback defaults
- Clean up dead IBIT references

Co-Authored-By: Claude <noreply@anthropic.com>

Author: Pigbibi