feat: route functions by system version

[uno-ko]

Summary

• Route TypeScript and Go Function registries and dispatch by (systemVersion, method).
• Treat the /functions/:version path as authoritative, validate it against the request body, and return versionMismatch for conflicts or unsupported versions.
• Scope Function and test-Function discovery to the requested system version with no cross-version fallback.
• Add standalone Function version options, Extension version inheritance, version-aware auto-registration, regression tests, and synchronized Korean/English/Japanese documentation.
• Add a minor changeset for @channel.io/app-sdk-server.

Why

When AppStore introduces a new major system contract such as v2, requests to /functions/v2 must not be silently dispatched to v1 handlers or return v1 schemas. The SDK now preserves the incoming system version through ingress, discovery, and dispatch.

Compatibility

• Existing registrations and direct calls without a version continue to use v1.
• The protobuf contract and /functions/:version route shape are unchanged.
• The deprecated TypeScript simple API remains v1-only and rejects other versions explicitly.
• Versions never fall back to handlers or schemas registered under another version.

Validation

• make verify (includes localized docs checks)
• ./scripts/check-public-content.sh
• git diff --check
• Independent code review: no Critical, Important, or Minor findings

[channeltalk]

https://desk.channel.io/#/channels/1/team_chats/groups/371781/6a7acc60e204627c27c1

[coderabbitai]

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