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Protocol generation is now derived from awg1.conf rather than stored: an interface speaks 3.1 when HeaderProtectionKey is set and 2.0 otherwise. The 3.0/3.1-only keys (HeaderProtectionKey, ContentPaddingAddition, the Rekey/Reject/Keepalive timers, MaxHandshakeAttempts, RandomTrailers, DisableCookies) are read from the conf and emitted only when non-empty, so 2.0 output stays byte-identical — verified by diffing both the client .conf and the full vpn:// string against the previous implementation. Changing generation invalidates every issued vpn:// key, so add POST /api/users/reissue. It recovers the client private key from inside the stored blob (the only place it exists), keeping ip/pub_key/psk_key intact, so nothing changes on the wire and users only need to re-import. users gains key_gen and vpn_key_prev, and users.db is snapshotted before the pass. install.sh gates 3.1 on module 3.x and kernel >= 5.5 (header protection needs the chacha library API, absent before 5.5) and falls back to writing a 2.0 conf instead of aborting, so older kernels keep working as before. HeaderProtectionKey is generated with awg genpsk and preserved on KEEP_DATA. The panel marks keys issued on a different generation and offers to reissue them; /api/v1 now returns gen alongside name/ip/vpn_key. Also add MIT license headers across the awg-ui sources.