Update top vault rankings and blacklisted listing

[miohtama]

Why

The homepage Top DeFi Vaults widget should rank safer known-protocol vaults by the requested three-month returns instead of one-month returns. The vault listings also need a dedicated blacklisted view that can accurately include those vaults in listing-level stats.

Lessons learnt

• The homepage uses slimmed vault payloads, so three-month return fields must be included in the slim schema before they can be used for ranking and display.
• Shared listing stats excluded blacklisted vaults inside the APY helper, so blacklisted-specific pages need an explicit opt-in all the way through the shared helper.

Summary

• Filtered homepage Top DeFi Vaults to known protocols with severe-or-safer risk and ranked/displayed them by three-month returns.
• Added a blacklisted stablecoin vault listing route, navigation entry, sitemap entry, and integration coverage.
• Added helper/unit coverage for frontpage eligibility, unknown protocols, and blacklisted stat inclusion.