fix(http): snapshot handler options

[thomhurst]

Summary

• snapshot replay scalars, delegates, routing values, and endpoints into immutable handler-pipeline options
• freeze the direct AddShield(shield, options) overload at registration while preserving per-handler option factories
• keep configuration reload as the explicit update path and document the contract

Closes #332

Validation

• dotnet build Kevlar.slnx -c Release
• dotnet run --project tests/Kevlar.Tests -c Release -f net8.0 --no-build -- --timeout 5m (1,199 passed)
• dotnet run --project tests/Kevlar.Tests -c Release -f net10.0 --no-build -- --timeout 5m (1,230 passed)
• dotnet run --project tests/Kevlar.IntegrationTests -c Release --no-build -- --timeout 5m (166 passed)
• allocation suites on .NET 8 and .NET 10
• pwsh scripts/Build-ApiDocs.ps1
• docs, API-doc, and changelog verification
• packed package snippets on .NET 8 and .NET 10 (184 each)
• npm run build

Snapshot allocation occurs only during registration/pipeline construction; request execution reads immutable fields and the materialized endpoint array.

[coderabbitai]

Important

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Plan: Pro Plus

Run ID: ca270eb6-15a9-4e0a-9053-9c39df6ea282

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