AuditEventService gains recordAs(actor, workspaceId, ...) — an overload
that takes an explicit actor string instead of deriving one from
SecurityContext. Used for non-MateClaw principals (currently just
webchat visitors), where there is no Spring Security auth and the
default record() path would write "system".
WebChatController injects AuditEventService and adds an audit() helper
that constructs the canonical actor string "webchat:<channelId>:<visitorId>"
so audit-event searches can filter by channel or visitor. Eight write
endpoints now log an audit row on success:
webchat.create-session, webchat.rename-session, webchat.pin-session,
webchat.archive-session, webchat.delete-session, webchat.stop-session,
webchat.regenerate-session, webchat.upload-file
/stream is intentionally NOT audited — message-volume noise, and
conversationService.saveMessage already leaves a durable trail.
Each row carries:
- username = webchat:<channelId>:<visitorId>
- action = webchat.<verb>
- resource = CONVERSATION / <conversationId>
- detailJson = {sessionId, ...action-specific fields}
WebChatAuditTrailTest (@SpringBootTest, 2 cases):
- createSession lands a row with the exact actor string + action
- rename + pin + archive + stop each leave a row (4 distinct actions)
Audit insert is async; tests poll up to 3s for the row to appear.
Regression: 9 webchat test classes (64 tests) green.
Part of epic #355.
