xfy f69a11ea05 feat(loadbalance): implement Session Sticky balancer
- Add 256-shard lock map for concurrent session routing
- Cookie-based session persistence with base64 encoding
- TTL expiration with background cleanup goroutine
- Support Secure, HttpOnly, SameSite cookie attributes
- Fallback to configured balancer when session target unavailable
2026-06-08 17:30:06 +08:00
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