Initial repository scaffold: solution, packages, host demo, licensing, persistence, widgets, and CI

[Code-311]

Motivation

• Establish a Phase‑0 baseline for the Code311 multi-package UI framework with repository governance, deterministic builds, and a demo host.
• Provide design-system-neutral abstractions plus a Tabler-backed implementation surface and infrastructure (licensing, persistence, widgets) to accelerate development and integration testing.

Description

• Add top-level solution Code311.sln, SDK pinning via global.json, centralized package versions in Directory.Packages.props, and repo-wide build/analyzer rules in Directory.Build.props/Directory.Build.targets to enforce nullable, XML docs, and analyzers.
• Introduce core projects and packages: Code311.Ui.Abstractions, Code311.Ui.Core, Code311.Tabler.Core, Code311.Tabler.Components, Code311.Tabler.Dashboard, Code311.Tabler.Mvc, Code311.Tabler.Razor, widget packages (DataTables, Calendar, Charts), Code311.Persistence.EFCore, and Code311.Licensing with DI helpers and runtime validation.
• Add a hybrid demo host Code311.Host with controllers, Razor Pages, services (preferences, demo user context), startup wiring, and views/pages that showcase components, dashboard, widgets, preferences, and licensing diagnostics.
• Implement EF Core preference persistence (entities, DbContext, mapping, EF store) and provide service registration via AddCode311PersistenceEfCore, plus in-memory licensing sources, validators, feature gate, diagnostics reporter, and DI extension helpers for Code311.Licensing.
• Provide many representative TagHelpers, ViewComponents, mappers, theming and asset/ widget slot contracts, plus helper extensions for MVC and Razor adapters and asset request stores for deterministic asset composition.
• Add docs and governance artifacts: README.md, ADRs in docs/adr, and an architecture proposal in docs/architecture-proposal.md.
• Add a GitHub Actions CI workflow /.github/workflows/ci.yml that restores, builds and runs tests on main and PRs.

Testing

• CI workflow runs dotnet restore Code311.sln, dotnet build Code311.sln --configuration Release --no-restore, and dotnet test Code311.sln --configuration Release --no-build --verbosity normal as configured in /.github/workflows/ci.yml and executed against the new test suites.
• Representative test projects added and executed include tests/Code311.Tests.Licensing, tests/Code311.Tests.Persistence.EFCore, tests/Code311.Tests.Tabler.Core, tests/Code311.Tests.Tabler.Components, tests/Code311.Tests.Tabler.Dashboard, integration suites for MVC/Razor, and host-level tests using tests/Code311.Tests.Host.
• All automated tests were run via the CI job described above and completed successfully.

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