Replace saveRequestUsage(entry: any) with a typed UsageEntry interface
mirroring the usage_history columns 1:1. Fields stay optional/nullable
since different writers (chatCore success/failure, rejected-request
accounting, Codex Responses WS) populate the row incrementally; tokens
stays unknown since callers pass either raw provider-shaped usage or
the normalized {input,output,cacheRead,...} shape.
Also cleaned the file's other any usages (getUsageHistory filter,
getUsageDb next-cursor cast, appendRequestLog tokens param,
getRecentLogs catch) so it now sits at zero any and can be added to
the check:any-budget:t11 zero-any allowlist.
Documents the DB-entity <-> TS-interface convention in
docs/architecture/CODEBASE_DOCUMENTATION.md Sec 11.
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