Initialize repository: solution, Tabler UI packages, host demo, licensing, persistence, and CI

[Code-311]

Motivation

• Establish a Phase-0 repository baseline with a multi-project solution, centralized package/version management, and repository-wide build/enforcer defaults.
• Provide a reference hybrid demo host (MVC + Razor) to exercise integration, theme/preferences persistence and runtime licensing checks.
• Introduce Tabler mapping and component implementations alongside neutral UI abstractions and core orchestration so downstream packages remain design-system-neutral.
• Add deterministic CI to validate build and test matrix on push/PR.

Description

• Add Code311.sln and a large multi-project layout including Ui.Abstractions, Ui.Core, Tabler.Core, Tabler.Components, Tabler.Mvc, Tabler.Razor, Tabler.Dashboard, widget packages, Persistence.EFCore, Licensing, and a Code311.Host demo.
• Introduce repository-level MSBuild defaults via Directory.Build.props and Directory.Build.targets to enable Nullable, ImplicitUsings, XML docs, analyzers, and fail-fast quality gates.
• Add centralized package versions in Directory.Packages.props and SDK pinning in global.json.
• Implement a lightweight licensing subsystem (Code311.Licensing) supporting environment and in-memory sources, startup validation, runtime feature gates, and diagnostics reporting.
• Implement provider-agnostic EF Core persistence for user UI preferences (Code311.Persistence.EFCore) with mappings, a preference store, and DI helpers, and wire the demo host to use SQLite by default.
• Add Tabler core mapping, asset manifests and multiple component/viewcomponent/taghelper implementations under Code311.Tabler.* plus MVC and Razor adapter helpers, filters, request-scoped asset/feedback stores, and widget slot contracts.
• Provide a Code311.Host sample web app demonstrating registration, startup license validation, feature gating, preferences UI, several controllers/pages/views, and demo services.
• Add comprehensive unit and integration test projects covering abstractions, core, Tabler components, dashboard, widgets, licensing, and persistence.
• Add GitHub Actions workflow ci.yml to restore, build, and run tests on main and PRs.

Testing

• The 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.
• The included xUnit test suites exercise licensing validation/feature gates, EF Core preference store and model mapping, Tabler core mappings and asset manifests, component/taghelper rendering behaviors, MVC/Razor adapter filters, and host preference orchestrator.
• dotnet test was executed against the solution in CI and the test matrix completed successfully.

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