fix(analytics): discard in-flight cache loader after invalidation (#463)

[Proxima84-code]

Resolves #463.

Root Cause

TtlCache.invalidate() previously cleared only this.entry, ignoring any concurrent this.inflight promise. When the loader finished, it unconditionally stored stale data into this.entry with a fresh TTL, defeating the invalidation.

Fix

• Introduced a generation sequence counter to TtlCache.
• invalidate() increments the generation and clears both entry and inflight.
• The in-flight loader resolves and sets this.entry only if currentGen === this.generation.
• Added unit tests in src/analytics/ttl-cache.spec.ts validating cache hits, request coalescing, and stale in-flight invalidation.

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