[Dejmenek]

Summary

This is the second PR for #165 and it is stacked on #166. It adds larger datasets, session helpers and three new groups of load tests: mixed browsing, expensive queries and the authentication flow.

Datasets

LoadTestDataSeeder generates Medium (50 users, 25 tournaments) and Large (200 users, 100 tournaments) datasets. Tournaments cycle through open, closed, completed and round robin, so standings have real matches to compute. The factory seeds through an overridable SeedAsync and exposes the tournament ids, round robin ids and user emails that scenarios pick from. Load test clients no longer handle cookies, so virtual users do not share one refresh token.

Helpers

• GraphQLLoadStep can send a refresh token cookie, pass the response headers and body to a callback, and treat a GraphQL error as an expected rejection through a predicate.
• VirtualUserSessions logs users in once during scenario init and picks a session per invocation.
• LoadTestRun.ExecuteAll runs several scenarios in one NBomber run and reports every failed threshold together.
• Step budgets come from measured baselines per dataset size. A step without a baseline fails loudly instead of falling back to a guess.

New tests

• Mixed browsing runs list, view and discover scenarios together against the default, Medium and Large datasets.
• Expensive queries (Medium and Large) cover owner and participant tournament history, round robin standings, the authenticated own history and the oversized page rejection.
• The authentication flow logs in, reads the profile, refreshes the session and logs out. It sends the newest refresh cookie after every rotation, because reusing a revoked token revokes all of that user's tokens.

Testing

All six new load tests pass locally. This PR only changes the load test project, so the unit and integration tests are unaffected and CI will run them. The load tests need Docker and run manually with dotnet test TournamentAPI.LoadTests --filter "Category=Load".

Part of #165.

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