Badge: key verifyUrl on tokenAddressBase58, not the account

[MarirosansP]

What

Fixes the verification.verifyUrl example in the Concordium Badge to key on the badge's tokenAddressBase58, not the owner account:

- "verifyUrl": "…/v1/badge-check/<account>",
+ "verifyUrl": "…/v1/badge-check/<tokenAddressBase58>",

Why

A verifier reading a card holds the badge itself — the token address is right there in the concordium block. Keying verifyUrl on the account made it (a) require pulling owner.account out first, and (b) return a list of the account's badges rather than a verdict for this one. Keying on the token address means one GET → one verdict for the exact badge in hand, which is the whole point of a self-resolving badge.

The hosted resolver's /v1/badge-check/:id accepts either form (account → all its badges; token address → that one badge), told apart by the base58 version byte, so nothing else changes.

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