Fix Hysteria External Proxy + include Hysteria in Clash subscription (#4053) (#4073)

* Fix Hysteria External Proxy + include Hysteria in Clash subscription (#4053)

Two related gaps on the Hysteria side of the subscription layer:

1) `genHysteriaLink` ignored `externalProxy` entirely, so an admin who
   pointed a Hysteria inbound at an alternate endpoint (e.g. a CDN
   hostname forwarding UDP back to the node) still got a link with the
   original server address. Mirror what `genVlessLink` / `genTrojanLink`
   already do: fan out one link per entry, substituting `dest` / `port`
   and picking up the entry's remark suffix. As a bonus, the salamander
   obfs password is now copied into the URL too — the panel-side link
   generator already did this, so the subscription output was lagging
   behind it.

2) `buildProxy` in `subClashService.go` had a protocol switch with cases
   for VMESS / VLESS / Trojan / Shadowsocks and a `default: return nil`.
   Hysteria inbounds fell into the default branch and silently vanished
   from the Clash YAML. Route Hysteria to a dedicated
   `buildHysteriaProxy` helper before the transport/security helpers run
   (applyTransport / applySecurity model xray streams, which Hysteria
   doesn't use).

   `buildHysteriaProxy` reads `inbound.StreamSettings` directly instead
   of going through `streamData` / `tlsData`, because those prune
   fields (`allowInsecure`, the salamander `finalmask.udp` block) that
   the mihomo Hysteria proxy wants preserved. Output shape matches
   mihomo's expectations:

     type: hysteria2                  # or "hysteria" for v1
     password / auth-str: <client auth>
     sni, alpn, skip-cert-verify, client-fingerprint
     obfs: salamander
     obfs-password: <finalmask.udp[salamander].settings.password>

The existing `getProxies` fanout over `externalProxy` already plugs in
for Clash, so with Hysteria now recognised, External Proxy entries
also flow through to the Clash output for Hysteria inbounds.

Closes #4053

* gofmt: align map keys in buildHysteriaProxy

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Co-authored-by: pwnnex <eternxles@gmail.com>

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