Add Critter Stack sample projects with Bobcat specs

[jeremydmiller]

Summary

• Copies 11 sample Critter Stack applications (BankAccountES, BookingMonolith, CleanArchitectureTodos, CqrsMinimalApi, EcommerceMicroservices, EcommerceModularMonolith, MeetingGroupMonolith, MoreSpeakers, OutboxDemo, PaymentsMonolith, ProjectManagement) into samples/
• Converts each project's xUnit integration tests to Bobcat .feature specs + Fixture classes
• Each test project becomes a net10.0 Exe (Bobcat console runner) with SpecsRunner entry point
• Demonstrates AlbaResource<Program> for ASP.NET Core integration, Marten data cleanup between scenarios, and Wolverine message handling patterns

Test plan

• All 11 Tests.csproj / *.Tests.csproj projects compile: dotnet build samples/*/Tests/*.csproj
• Each sample can be run against a local PostgreSQL instance with the appropriate connection string
• Feature files match the step methods in their corresponding Fixture classes (verified at compile time by Bobcat.Generators)

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