feat(profiles): per-agent-token profile_pin + server-side enforcement (Profiles v2 T3, MCP-3242) #2138

Job	Run time
Build Frontend	22s
Cross-Platform Logging Tests (windows-latest, $env:LOCALAPPDATA\mcpproxy\logs, Windows Applicatio...	1m 36s
End-to-End Tests (ubuntu-latest, 1.25)	11m 2s
OAuth E2E Tests	49s
Cross-Platform Logging Tests (ubuntu-latest)	1m 42s
Cross-Platform Logging Tests (macos-latest, $HOME/Library/Logs/mcpproxy, macOS File System Progra...	44s
Integration Tests	5m 0s
Stress Tests	-1s
	21m 14s

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