fix(controller): dedup shared clients before limit

[bennyz]

Summary

Deduplicate requested shared_with clients before enforcing the maximum number of entries. The limit now applies to distinct clients.

Reproduction and validation

• The regression test fails on the pre-fix commit: 12 copies of one client are rejected as exceeding the 10-client limit.
• The test passes with this change; the same request was accepted and deduplicated on the Pi's k3s cluster.
• go test ./internal/service/client/v1 passes.

Stack: 2 of 5; depends on the shared-access reconciliation PR below it.

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