feat: advanced cache management with versioning, pattern cleanup, and SWR

[saidai-bhuvanesh]

Fixes #6103

Phase 2: Advanced Cache Management

• Created versioned cache envelopes (CacheEnvelope) in lib/cache.ts to invalidate structures on schema upgrades.
• Added regex pattern-based cache invalidation (invalidatePattern) to selectively purge cache entries.
• Implemented Stale-While-Revalidate (SWR) logic in DistributedCache to optimize user response speed by returning stale cached data while updating in the background.
• Added comprehensive cache tests in tests/cache-advanced.test.ts.

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Unfortunately, this PR has been automatically closed because you are not assigned to the linked issue #6103 — feat(cache): implement cache versioning, pattern-based cleanup, and SWR.

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