- replace fan-in channel recommendation searches with errgroup-based execution
- return SearchResult directly from Redis recommendation helper functions
- fallback leading-dot recommendation input to initial token suggestions
- remove unused recommendLenType parameter from fuzzy member set validation
- clean up small model selection and naming issues
- replace interface{} with any across ~30 files for Go 1.18+ style
- adopt for-range-over-int loops in place of explicit index loops
- use maps.Copy from stdlib to replace manual map copy loops
- use min() builtin for exponential backoff delay cap in retry_manager
- add MongoDB 7.0 K8s manifests (StatefulSet, Service, PVC, Secret)
- document PostgreSQL and MongoDB deploy steps in deploy.md with SSH tunnel port mappings
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