Clarify NodaTime serializer configuration

[dukesteen]

Summary

• document explicit JsonSerializerOptions and NodaTimeJobSerializer registration as the primary customization path
• explain that Immediate.Jobs owns a dedicated durable JSON contract rather than using ASP.NET Core JSON options
• clarify registration order so the custom IJobSerializer is preserved by Jobs registration
• keep AddImmediateJobsNodaTime() as an optional defaults-only convenience
• warn that all workers must use compatible serializer settings and time-zone IDs

Stack

This PR is stacked on #134 because the package-specific NodaTime README is introduced there. After #134 merges, this PR can be retargeted to main.

Validation

• dotnet pack src/Immediate.Jobs.NodaTime/Immediate.Jobs.NodaTime.csproj -c Release -v minimal
• verified the generated package contains an exact copy of the updated README

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[coveralls]

Coverage Report for CI Build 32188301679

Warning

No base build found for commit bf10a15 on docs/package-specific-readmes.
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If a base build is processing, this comment will update automatically when it completes.

Coverage: 87.613%

Details

• Patch coverage: No coverable lines changed in this PR.

Uncovered Changes

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Coverage Regressions

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Coverage Stats

Relevant Lines:	12118
Covered Lines:	10617
Line Coverage:	87.61%
Coverage Strength:	2.58 hits per line

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💛 - Coveralls