stacklok / toolhive / 23344701518

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Add BackendReplicas and SessionCacheSize to RunConfig (#4239)

* feat(runner): add BackendReplicas and SessionCacheSize to RunConfig (RC-1)

Extends RunConfig with two optional, zero-value-safe fields needed by
the proxyrunner horizontal scaling epic (THV-0047). BackendReplicas
(*int32, nil = unmanaged) controls StatefulSet replica count; SessionCacheSize
(int, 0 = default 1000) bounds the local LRU session cache. Both fields
use omitempty so existing configs deserialize without modification.

Closes #4203

* fixes from review

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Co-authored-by: taskbot <taskbot@users.noreply.github.com>

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