docs(README): update to modern targetRef policies #15562
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Motivation
README.md contained deprecated TrafficRoute policy example and old policy names (Traffic Permissions, Traffic Routing, etc.), misleading first-time visitors with outdated v1.x API patterns.
Implementation information
Replaced TrafficRoute example (lines 69-97):
TrafficRoutewith sources/destinations matchingMeshHTTPRoutewith targetRef-based selectorsUpdated features list (lines 117-123):
GUI screenshot unchanged (already v3).
Supporting documentation
Fixes #13248