Deprecate lastTradedPrice for 24/5 US equity streams

[gsilva5]

Summary

• Deprecate lastTradedPrice as a supported production input only for 24/5 U.S. Equity Streams.
• Keep the field in the RWA Advanced (v11) schema and clarify that availability and production support vary by stream.
• Remove lastTradedPrice from the advertised capabilities of the 24/5 U.S. Equities guide and add the customer notice and migration date.
• Add a scoped cross-reference in the v11 documentation and update the generated Data Streams LLM documentation.

This change does not deprecate lastTradedPrice across all RWA Advanced (v11) streams. APAC equities and the v10 schema are unchanged.

Validation

• Prettier check passed for all changed source files.
• Data Streams LLM documentation regenerated successfully.
• LLM validation completed successfully; reported warnings are pre-existing and unrelated.
• git diff --check passed.

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