feat(server-detail): display + edit headers/env, with reveal & convert-to-secret #1365

Job	Run time
Build Frontend	25s
OAuth E2E Tests	44s
End-to-End Tests (ubuntu-latest, 1.25)	7m 15s
Cross-Platform Logging Tests (windows-latest, $env:LOCALAPPDATA\mcpproxy\logs, Windows Applicatio...	1m 46s
Cross-Platform Logging Tests (macos-latest, $HOME/Library/Logs/mcpproxy, macOS File System Progra...	1m 41s
Cross-Platform Logging Tests (ubuntu-latest)	1m 41s
Integration Tests	5m 23s
Stress Tests	-1s
	18m 54s

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