feat(audit): server-side paging, search and category filter; one event format

The page rendered a map of eleven event types to labels and seven to colours.
The server emits forty-seven. Everything unmapped fell through to its raw
string, so "Key Assigned" in green sat above "workflow.schedule_updated" in
grey — the same kind of fact in two formats, which made the column look like it
carried a meaning it did not.

Presentation is now derived rather than enumerated. Event types are named
<category>.<action> by every call site, so the category becomes a chip, the
action is humanised, and the tone comes from the verb. A type added to the
server tomorrow gets a sensible label and colour with no second list to update;
the override table holds only the dozen the rule reads badly for. Every row is
one treatment, and colour never carries meaning alone — the sentence beside it
says the same thing in words.

Paging and filtering are server-side, unlike the fleet lists that answer with
everything and slice in the browser. audit_retention_days is a licensed
entitlement measured in months, and this log is read to answer questions about
the past, so a browser filtering the most recent page would report "no results"
for events that exist. GET /api/audit now takes q, category, limit and skip and
answers {events, total} — a short page is not evidence of the end of the log,
which is why the total is counted rather than inferred.

audit_logs had no indexes at all: every read was a collection scan with an
in-memory sort over an append-only collection. Adds (instance_id, created_at)
and warns rather than failing, matching EnsureSecretIndexes.

Two bugs found by running the deriver over all forty-seven real types rather
than eyeballing it: the tone rules matched only past-tense verbs, leaving
auth_provider.delete drawn as neutral beside key.deleted in red; and
"unaccepted" matched "accepted", so withdrawing an acceptance read as the same
caution as granting one.

web/tsconfig.tsbuildinfo

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