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Xray's freedom outbound accepts a numeric proxyProtocol (0 disabled, 1 or 2 for the PROXY protocol version), but the panel had no field for it and the typed form adapter dropped the key on save — so a value set via the JSON editor disappeared the moment the outbound was saved. Model proxyProtocol through the freedom wire schema, the form schema, and both adapter directions (clamped to 0/1/2, omitted from the wire when 0), and add a Select (none / v1 / v2) to the freedom section of the outbound form. Add round-trip test coverage and the proxyProtocol label across all locales. Closes #4486