docs: align README, DEVELOPMENT guide, Index and skills with Syncfusion.Blazor.Toolkit 2.0 API

[PrinceOliver]

📍 Agent Session: View Full Session | 👤 Requested by: @PrinceOliver | 🤖 Agent: Agent

📋 Task Context

Update repository documentation (README, DEVELOPMENT.md, Index.md, and the AI skills under .github/skills) so build commands, package versions, namespaces, enum names, service registration and links match the current 2.0 package structure (single root namespace Syncfusion.Blazor.Toolkit).

📝 Implementation Summary

Core docs

• README.md: build path -> ./src/Syncfusion.Blazor.Toolkit.slnx; Version="x.x.x" -> 2.0.0; chart sample @using -> Syncfusion.Blazor.Toolkit; sales mailto subject fixed (was "Maui toolkit").
• .github/DEVELOPMENT.md: build path -> ./src/Syncfusion.Blazor.Toolkit.slnx.
• .github/Index.md + evidences/performance/: renamed virtualization-startegy.md -> virtualization-strategy.md and fixed the index link.

Skills (.github/skills/**)

• Replaced legacy sub-namespaces (.Charts, .Buttons, .Inputs, .Calendars, .Popups, .Spinner) with Syncfusion.Blazor.Toolkit in all skill docs (35 files). Syncfusion.Blazor.Toolkit.Data is untouched.
• Charts skill: package is Syncfusion.Blazor.Toolkit (no .Charts, no Syncfusion.Blazor.Themes); service registration is AddSyncfusionBlazorToolkit(); SelectionMode.* / Syncfusion.Blazor.Toolkit.Charts.SelectionMode.* -> ChartSelectionMode.*, and the API reference enum is renamed to ChartSelectionMode (matches ChartEnumerations.cs).
• Charts getting-started: removed the nonexistent Syncfusion.Blazor.Core/.../syncfusion-blazor.min.js and Toolkit.Charts/.../sf-chart.min.js script references; now points at _content/Syncfusion.Blazor.Toolkit/scripts/chart.js (exists in src/wwwroot/scripts).

Documentation-only; no source code changed.

✅ Verification Results

• ✅ dotnet build ./src/Syncfusion.Blazor.Toolkit.slnx (net8.0/net9.0/net10.0): Build succeeded, 0 errors

🔍 Quality Checklist

• Code follows project conventions
• All tests pass
• No security vulnerabilities introduced
• Documentation updated (if applicable)
• Breaking changes documented (if any)

⚠️ Human Review Required

Please pay special attention to:

• Chart script reference in references/getting-started.md now points to _content/Syncfusion.Blazor.Toolkit/scripts/chart.js; please confirm this is the intended way (vs. fully automatic loading via JS interop) to document it.
• First build attempt failed only because the CycloneDX global tool was not installed in the sandbox (environment issue); after installing it the build passed. Not related to this change.
• Playwright test-plan markdown files under tests/ still mention Syncfusion.Blazor.Toolkit.Buttons; left untouched as out of scope (not user documentation).

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[github-actions]

CI Summary

Job	Status
bUnit (.NET 8 / 9 / 10)	✅ Passed
Playwright	✅ Passed
NuGet vulnerability scan	✅ Passed
ESLint security	✅ Passed
XSS / unsafe markup scan	✅ Passed
Pack (.NET 8/9/10, unsigned)	✅ Passed

Overall: ✅ All checks passed