chore: upgrade EqDemo.AspNetCoreReact.AdvancedSearch to .NET 8.0

[devin-ai-integration]

Summary

Upgrades the React AdvancedSearch sample project from .NET 6.0 to .NET 8.0, including the breaking migration from the removed Microsoft.AspNetCore.SpaServices.Extensions to the new Microsoft.AspNetCore.SpaProxy pattern.

csproj changes:

• Target framework net6.0 → net8.0
• Microsoft.AspNetCore.SpaServices.Extensions 6.0.1 → replaced with Microsoft.AspNetCore.SpaProxy 8.0.11
• Microsoft.EntityFrameworkCore.Sqlite 6.0.1 → 8.0.11
• Microsoft.EntityFrameworkCore.SqlServer 6.0.1 → 8.0.11
• Microsoft.Data.SqlClient 2.1.7 → 5.2.2
• Microsoft.IdentityModel.JsonWebTokens 6.34.0 → 6.35.0 (required by SqlClient 5.2.2)
• System.IdentityModel.Tokens.Jwt 6.34.0 → 6.35.0 (same transitive dependency)
• Added SpaProxyLaunchCommand (npm start) and SpaProxyServerUrl (http://localhost:3000) properties for dev-time SPA proxy
• Updated PublishRunWebpack target to publish React build output to wwwroot/ (was ClientApp/build/) so that UseStaticFiles() can serve it in production

Startup.cs changes:

• Removed using Microsoft.AspNetCore.SpaServices.ReactDevelopmentServer
• Removed AddSpaStaticFiles, UseSpaStaticFiles, and UseSpa/UseReactDevelopmentServer calls
• Added UseDefaultFiles() + UseStaticFiles() for serving the built SPA from wwwroot
• Added MapFallbackToFile("index.html") inside UseEndpoints for client-side routing

dotnet restore and dotnet build pass with 0 errors, 0 warnings.

Review & Testing Checklist for Human

• Run the app in Development mode (dotnet run) and confirm the SPA proxy launches the React dev server on http://localhost:3000 and the UI loads correctly through the ASP.NET Core host.
• Test production publish path: Run dotnet publish -c Release, then verify the React build output lands under wwwroot/ in the publish directory (not ClientApp/build/). Serve the published output and verify index.html is served for client-side routes via the fallback.
• Verify PublishRunWebpack file mapping: The %(RecursiveDir)%(Filename)%(Extension) pattern is intended to strip the ClientApp\build\ prefix when copying to wwwroot\. This was not tested with an actual dotnet publish — only dotnet build was verified.
• Verify EasyQuery endpoints still work at runtime (e.g. advanced search queries execute against SQLite).

Notes

• Microsoft.IdentityModel.JsonWebTokens and System.IdentityModel.Tokens.Jwt were bumped from 6.34.0 → 6.35.0 to resolve a transitive dependency conflict introduced by Microsoft.Data.SqlClient 5.2.2. Without this, dotnet restore fails with NU1605.
• Legacy System.* compatibility packages (System.Net.Http, System.Text.RegularExpressions, System.Drawing.Common, System.Data.SqlClient) were left as-is since the build succeeds without changes. They could be cleaned up in a follow-up.
• Snyk security/license checks are failing but are non-required and not used by the team.

Link to Devin session: https://app.devin.ai/sessions/c46cc86c9d344bfcad3c8d4108483447
Requested by: @tobydrinkall

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[devin-ai-integration]

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