[yiguodev]

Summary

- Xray-core v26.10.17
+ Xray-core v26.10.21

Align the Go module and default native-build pins with release commit 1b1647cd9ddf, including its required fallback certificate dependency. Update the English and Chinese build documentation.

Evidence

• Before: the module and default build script selected v26.10.17.
  After: both select v26.10.21, and an isolated macOS CGoInvoke version call returns 26.10.21.
• go test ./... -count=1 and all 8 python3 build/test_build.py tests passed.
• python3 build/main.py apple go succeeded: all 5 XCFramework slices passed architecture, C export, header and module-map checks.
• python3 build/main.py android succeeded: all 4 AAR ABIs embed the expected Core module, satisfy 16 KiB ELF alignment, and retain the required Java bridge methods.
• go.mod and go.sum were restored byte-for-byte after both native builds; git diff --check passed.

Merge Danger

Door: two-way

Revert the dependency and build pins together to restore the previous Core.

Blast Radius: native

The default Core changes across all native targets. Local native validation covered Apple and Android; Windows/Linux builds and VPN sessions were not exercised.

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