umputun / stash / 19720805290

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feat(store): add optional in-memory cache for read operations (#13)

* feat(store): add optional in-memory cache for read operations

Add loading cache wrapper using go-pkgz/lcw/v2 that:
- Caches values on first read (loading cache pattern)
- Automatically invalidates on Set/Delete operations
- Uses LRU eviction with configurable max keys

Useful for PostgreSQL deployments where network latency
makes caching beneficial, or high-volume read workloads.

Configuration:
- --cache.enabled / STASH_CACHE_ENABLED
- --cache.max-keys / STASH_CACHE_MAX_KEYS (default: 1000)

* test: add integration test for cache layer

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