Add Phase‑0 repository baseline: solution, projects, licensing, persistence, Tabler packages, host, tests and CI

[Code-311]

Motivation

• Establish a Phase‑0 baseline for the Code311 ecosystem with a single solution, repository governance, and deterministic SDK/package settings.
• Provide a minimal but functional host demo and implementations for licensing, EF Core persistence, Tabler core/components/dashboard/widgets, and MVC/Razor adapters to validate integration points.
• Enforce repository-wide quality gates (nullable, XML docs and analyzers) and centralized package versions for consistent builds.

Description

• Added Code311.sln, global.json, Directory.Build.props, Directory.Build.targets, and Directory.Packages.props to pin SDK, enable nullable/implicit usings/XML docs, treat warnings as errors, and centralize package versions.
• Introduced many new projects under src/ including Code311.Ui.Abstractions, Code311.Ui.Core, Code311.Tabler.Core, Code311.Tabler.Components, Code311.Tabler.Dashboard, widget packages (DataTables, Calendar, Charts), Code311.Persistence.EFCore, Code311.Licensing, and a demo host Code311.Host with controllers, pages and views.
• Implemented core subsystems: Tabler semantic class mapping and theming, TagHelpers/ViewComponents for components, widget slot/asset contracts and serializers, licensing sources/validation/feature gate/diagnostics, and EF Core preference store with mapping/config and DI registration helpers.
• Added a comprehensive test matrix under tests/ covering unit and integration tests for abstractions, core, Tabler components, dashboard, widgets, licensing and persistence, and added a GitHub Actions workflow ci.yml to run dotnet restore, dotnet build, and dotnet test for Code311.sln.

Testing

• No automated tests were executed as part of this change during the rollout; a CI workflow was added that will run dotnet restore Code311.sln, dotnet build Code311.sln --configuration Release --no-restore, and dotnet test Code311.sln --configuration Release --no-build --verbosity normal on push and pull requests.
• The repository now includes multiple test projects under tests/ that exercise licensing validation, EF Core preference store round‑trips, Tabler core mappings, component rendering TagHelpers/ViewComponents, MVC and Razor adapter filters, and widget slot/asset behaviors.
• Local developers can run the full matrix with dotnet test Code311.sln to validate the baseline before CI runs.

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