fix(sdk-client-common): identify() bootstrap does not set flagstore in FDv2

[joker23]

This PR will fix per-context bootstrap behavior for FDv2.

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Note

Medium Risk
Changes identify/bootstrap flag-store wiring for FDv2; incorrect parsing or context mapping would break per-context evaluations, but scope is limited and covered by new tests.

Overview
FDv2 identify() now loads bootstrap into the per-context flag store instead of assuming the caller already applied it (e.g. via presetFlags before identify).

When identifyOptions.bootstrap is present, FDv2DataManagerBase parses it with readFlagsFromBootstrap (or uses pre-parsed bootstrapParsed) and calls flagManager.setBootstrap(context, …) for the identified context, then resolves identify immediately as before.

Tests cover setBootstrap on first identify and on re-identify with updated bootstrap payloads.

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[github-actions]

@launchdarkly/js-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 26360 bytes
Compressed size limit: 29000
Uncompressed size: 129188 bytes

[github-actions]

@launchdarkly/js-client-sdk size report
This is the brotli compressed size of the ESM build.
Compressed size: 32099 bytes
Compressed size limit: 34000
Uncompressed size: 114604 bytes

[github-actions]

@launchdarkly/js-client-sdk-common size report
This is the brotli compressed size of the ESM build.
Compressed size: 39099 bytes
Compressed size limit: 39300
Uncompressed size: 213748 bytes

[github-actions]

@launchdarkly/browser size report
This is the brotli compressed size of the ESM build.
Compressed size: 179745 bytes
Compressed size limit: 200000
Uncompressed size: 831788 bytes

[joker23]

@cursor review

[cursor]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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