Add international vault listings

[miohtama]

Why

Non-USD vaults need a dedicated listing and detail-page handling so their TVL is shown consistently in USD while still exposing the denomination and native currency context. The existing pages treated some non-USD vault NAV values as already-dollar-denominated or skipped conversion when the backend supplied an empty denomination rate object.

Lessons learnt

Git worktrees do not copy ignored local files such as .env.local and data/, so private vault chart data can fail locally even when the main checkout works. The new worktree documentation records the required env and data symlink setup.

EURCV metadata may not have its own USD rate, so the frontend needs to infer the native currency and use stablecoin metadata fallback rates. Empty denomination_token_rate objects should not block that enrichment.

Summary

• Add an International vault listing page for non-USD vaults and include it in vault listing navigation and the sitemap.
• Convert current and peak TVL through denomination exchange rates in listings and vault detail metrics, including native-currency context and tooltips for non-USD/depegged vaults.
• Enrich vault detail loads with stablecoin metadata fallback rates, including fetched timestamps and empty-rate-object handling.
• Hide the utilisation chart on vault detail pages because vault protocols do not report useful utilisation data.
• Add worktree documentation and cross-links for local env/data setup.