fix(router): nil Ristretto caches after graphMux shutdown

[arutkowski00]

Problem

Ristretto.Close() clears cache entries but leaves cache structs referenced on the shut-down graphMux, preventing garbage collection of the old generation after config reload.

Fix

Close and nil all Ristretto cache pointers on shut-down muxes. Remove shut-down muxes from graphMuxList.

Test plan

• go test ./router/core/...

Part of config hot-reload memory leak investigation (monday.com #3221).

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b40f14 and df3ad45.

📒 Files selected for processing (1)

• router/core/graph_server.go

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