[FEATURE] - Multi-tenancy with namespace-scoped pools

[patrick-hermann-sva]

Summary

Support namespace-scoped IP pools to enable multi-tenancy, allowing different teams or environments to manage their own isolated IP address pools.

Benefits

• Teams can self-service their own IP pools without conflicts
• RBAC can be scoped per namespace for fine-grained access control
• Supports organizational separation (dev/staging/prod, team A/team B)
• Prevents accidental cross-team IP allocation

Suggested Approach

• Make NetworkConfig CRs namespace-scoped (currently cluster-scoped or single-namespace)
• Add namespace filtering to gRPC queries
• Support cross-namespace views for platform admins
• Helm chart updates for multi-namespace RBAC

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