thor: include startup stats in auditThorSystemEvent("Startup") and co-locate with recordGlobalMetrics

[Copilot]

auditThorSystemEvent("Startup") was called before startup metrics were computed, so the audit log captured no timing or cost data. The recordGlobalMetrics call with those stats was placed separately after.

Changes

• thgraphmanager.cpp: Refactored auditThorSystemEventBuilder to accept optional std::initializer_list<StatisticKind> / std::initializer_list<stat_type> params, formatting each stat as name=value via queryStatisticName + formatStatistic. Existing 3-arg overload delegates to this. Added matching auditThorSystemEvent public overload.

• thgraphmanager.hpp: Declared the new overload; added #include "jstats.h" and #include <initializer_list>.

• thmastermain.cpp: Moved auditThorSystemEvent("Startup") and auditStartLogged = true to immediately after recordGlobalMetrics, passing the same startup stats:

recordGlobalMetrics("Queue", { {"component", "thor"}, {"name", thorName} },
    { StNumStarts, StTimeProvision, StTimeStart, StCostStart },
    { 1ULL, workerProvisionTimeNs, startupElapsedTimeNs, costStart });
auditThorSystemEvent("Startup",
    { StNumStarts, StTimeProvision, StTimeStart, StCostStart },
    { 1ULL, workerProvisionTimeNs, startupElapsedTimeNs, costStart });
auditStartLogged = true;

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