feat(xray): update xray-core to v26.7.11 and adapt panel

Bump xtls/xray-core to 50231eaf (v26.7.11) and the three binary pins
(DockerInit.sh, release.yml x2) in lockstep.

Adapt the panel to the upstream changes:

- Shadowsocks "none"/"plain" and VMess "none"/"zero" were removed from
  the core. A migration rewrites stored none/plain SS methods to a
  supported cipher and none/zero VMess security to "auto" (on both the
  clients column and inbound settings JSON); the SS build-time heal does
  the same so a row injected after boot cannot brick startup. The removed
  values are dropped from every frontend option list, schema and adapter,
  and coerced to "auto" at the Go link/sub/Clash emit sites and both link
  importers. Fix the CipherType_NONE sentinel that no longer compiles.

- Unencrypted vless/trojan outbounds to a public address are now refused
  by the core. Validate outbounds through the vendored config loader when
  saving the xray template and when storing/merging outbound
  subscriptions, so one such outbound cannot keep the core from starting.

- New TCP finalmask type "xmc" (Minecraft mimicry): add it to the sub
  link allowlist, the frontend enum and the FinalMask form (hostname,
  usernames, required password), and document it.

- streamSettings gained a "method" alias for "network"; canonicalize it
  to "network" at inbound save time and in the form adapters/schema so a
  method-keyed config keeps its transport.

- New root "env" config key is passed through xray.Config, compared in
  Equals, and forces a restart in the hot diff.

- REALITY now defaults minClientVer to 26.3.27; update the form
  placeholder.

internal/sub/service.go

@@ -714,7 +714,7 @@ func (s *SubService) genVmessLink(inbound *model.Inbound, email string) string {
 		return ""
 	}
 	obj["id"] = client.ID
-	obj["scy"] = client.Security
+	obj["scy"] = normalizeVmessSecurity(client.Security)
 
 	externalProxies, _ := stream["externalProxy"].([]any)
 
@@ -726,6 +726,18 @@ func (s *SubService) genVmessLink(inbound *model.Inbound, email string) string {
 	return buildVmessLink(obj)
 }
 
+// normalizeVmessSecurity maps the vmess security values xray-core v26.7.11
+// removed ("none"/"zero"), plus the legacy empty string, to "auto" so links
+// and subscriptions stop advertising values the upgraded server rejects on
+// the wire.
+func normalizeVmessSecurity(security string) string {
+	switch security {
+	case "", "none", "zero":
+		return "auto"
+	}
+	return security
+}
+
 // vlessEncryptionEnabled reports whether the VLESS inbound settings enable
 // VLESS-level encryption (vlessenc / ML-KEM). When on, the encryption/decryption
 // fields hold a generated dotted string (e.g. "mlkem768x25519plus.native.0rtt.<key>");
@@ -2131,6 +2143,7 @@ var validFinalMaskTCPTypes = map[string]struct{}{
 	"header-custom": {},
 	"fragment":      {},
 	"sudoku":        {},
+	"xmc":           {},
 }
 
 // applyKcpShareParams reconstructs legacy KCP share-link fields from either