freedomToWire called Object.entries(s.fragment), but getFieldsValue(true)
returns freedom settings without a fragment object when the Fragment switch
is off (its sub-fields never register). That threw 'Cannot convert undefined
or null to object' and silently killed the save. Guard fragment with a
fallback so an unset value is treated as empty.
While verifying against xray-core's freedom config, also:
- add the missing userLevel field (schema, form schema, adapter, UI)
- fix noise applyTo enum to ip/ipv4/ipv6 (xray rejects the old host/all)
Closes#4686
f02018cfb7