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.

docs/content/docs/zh/config/transports.mdx

@@ -117,7 +117,8 @@ Session-ID 字段（`sessionIDPlacement`、`sessionIDKey`、`sessionIDTable`、
 **FinalMask** 在传输方式和安全层**之后**包裹流量，因此它既能伪装那些承载不了 TLS 的
 传输（如 mKCP），也能在 TLS 之上再加一层外壳。掩码按方向分别配置：
 
-- **TCP 掩码** — `fragment`、`sudoku`、`header-custom`。
+- **TCP 掩码** — `fragment`、`sudoku`、`header-custom`、`xmc`（把流量伪装成
+  Minecraft 协议；密码必填，主机名和玩家用户名可选）。
 - **UDP 掩码** — `salamander`、`mkcp-legacy`、`header-custom`、`xdns`、`xicmp`、
   `noise`、`sudoku`、`realm`。（`mkcp-legacy` 重现旧版 mKCP 的头部混淆。）
 - **QUIC 参数** — 拥塞控制（`reno`、`bbr`、`brutal`、`force-brutal`）、Brutal 上/下行