Migrate samples/app to src/app and convert from WebAssembly to Blazor Server

[wendellmva]

Summary

Move the samples application from samples/app to src/app, converting from Blazor WebAssembly to Blazor Server rendering.

Motivation

• Blazor Server provides faster initial load and simpler deployment
• Consolidates app into src/ directory structure
• Enables server-side features (direct API access, no CORS issues)

Tasks

• Migrate components from samples/app/Components/ to src/app/Components/
• Migrate pages from samples/app/Pages/ to src/app/Components/Pages/
• Migrate layout from samples/app/Layout/ to src/app/Components/Layout/
• Migrate services from samples/app/Services/
• Migrate wwwroot content (Tailwind, markdown content)
• Update Program.cs for Blazor Server configuration
• Update _Imports.razor with required namespaces
• Replace LocalStorageService (WASM) with server-compatible solution
• Update ContentGenerator.Build.targets path reference
• Verify Tailwind CSS build works
• Remove samples/app after successful migration
• Update solution file references

Acceptance Criteria

• App runs as Blazor Server from src/app
• All existing pages and components work
• Tailwind CSS builds correctly
• Content (markdown specs) loads correctly
• samples/app directory removed
• Solution builds without errors