Wallet-supported chains

GET /v1/wallet/supported-chains

Proxy of the upstream Minara /tokens/supported-chains endpoint. Returns the list of chains the wallet backend can credit deposits on (EVM family + Solana). Used by the Portfolio Deposit modal to filter the chain picker so users can't pick a chain that would result in lost funds. Response is stable across releases; the gateway caches in-process for 24h and the web UI loads once at app startup. On upstream failure the endpoint returns an empty list rather than stale data — the wallet picker prefers to show nothing over showing the wrong thing.