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

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Summary

Upgrades the Blazor Server AdvancedSearch project from .NET 6.0 to .NET 8.0 by updating the target framework and Microsoft package references.

Package changes:

Package	Old	New
TargetFramework	net6.0	net8.0
Microsoft.AspNetCore.Diagnostics.EntityFrameworkCore	6.0.1	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
System.IdentityModel.Tokens.Jwt	6.34.0	6.35.0

The identity token packages were bumped from 6.34.0 → 6.35.0 to satisfy a transitive dependency from Microsoft.Data.SqlClient 5.2.2. Third-party packages (Korzh.EasyQuery.*, Korzh.DbUtils.*, EasyData.Exporters.*) were left unchanged as they target netstandard2.0 and build cleanly on net8.0.

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

Review & Testing Checklist for Human

• SqlClient encryption default change: Microsoft.Data.SqlClient 4.0+ changed the default for Encrypt from false to true. If the app connects to SQL Server instances without valid TLS certificates, connections will fail at runtime. Verify connection strings include Encrypt=false or TrustServerCertificate=true if needed.
• Runtime smoke test: Build passes but no runtime testing was performed. Run the app locally and verify the advanced search UI loads and queries execute correctly against both SQLite and SQL Server backends.
• System. compatibility packages*: System.Data.SqlClient, System.Drawing.Common, System.Net.Http, and System.Text.RegularExpressions are still referenced — these are inbox on net8.0 and could be removed in a follow-up cleanup.

Notes

• The identity package bumps (6.34.0 → 6.35.0) were not in the original spec but were required to resolve NU1605 package downgrade errors caused by Microsoft.Data.SqlClient 5.2.2's transitive dependencies.

Link to Devin session: https://app.devin.ai/sessions/41ffd65e564d4392acbc0c4ca1790ebe
Requested by: @tobydrinkall

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

View in Devin Review to see 2 additional findings.