feat: added aspnet core scaffolding and templates

[ashikulislamm]

Description

Adds comprehensive, configurable ASP.NET Core (.NET 8/9/10) scaffolding support to create-servest.

Features Added

• 3 Architectural Variants:
• aspnet-enterprise-architecture with Clean Architecture, CQRS (MediatR), and EF Core.
• aspnet-mvc (mvc) with layered controllers and service patterns.
• aspnet-minimal-api (minimal-api) with route groups.
• ⚙️ Composable Engine & CLI Options:
  • --database: sqlite, postgres, sqlserver, mysql, none.
  • --auth: jwt, none.
  • --authorization: rbac, none.
  • --docker / --no-docker with multi-container docker-compose.yml.
  • --tests: unit-integration, unit, none with isolated in-memory test factory.
  • --example: sample-crud, none (clean-slate option).
  • --non-interactive, --dry-run, and short aliases.
• 📖 Documentation: Added full ASP.NET Core guide in docs/guide/aspnet.mdx.

Verification

• pnpm run lint (0 errors, 0 warnings)
• pnpm run typecheck (0 errors)
• pnpm run build (All packages built)
• pnpm run test (25/25 tests passed)
• Verified scaffolded projects compile with 0 warnings/errors on dotnet build and pass all tests on dotnet test.

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