* fix(lark): tolerate binding token clock skew
Clamp binding-token expiry against the database clock while preserving the 15-minute TTL cap. Return the persisted expiry so binding cards reflect the value enforced by Postgres.
* docs(lark): correct stale table name in binding token TTL comments
Post-#124 the table is channel_binding_token (with the
channel_binding_token_ttl_cap CHECK); update the two comments in
types.go and binding_token_test.go that still named the pre-generalization
lark_binding_token table.
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Co-authored-by: Bohan-J <bohan.optimism@gmail.com>
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