Add Age key helper (X25519/Hybrid) and end-to-end key validation APIs

[Copilot]

This ports the upstream Age key helper feature into Tabby: users can now generate X25519/MLKEM768-X25519 keypairs, derive public keys from secrets, and validate Age keys from settings.
The change wires these capabilities through the full native/core stack and exposes them in Meta Feature settings.

Ports MetaCubeX#768.

• Core bridge + native exports

  • Added Go native exports for:
    • keypair generation (genX25519KeyPair, genHybridKeyPair)
    • secret/public key validation
    • secret→public conversion
  • Added corresponding JNI bindings in core/src/main/cpp/main.c.
  • Extended Kotlin bridge externs in Bridge.kt and surfaced high-level APIs in Clash.kt.
  • Added AgeKeyPair model for typed keypair decoding.

• Validation behavior

  • Updated age secret key validation to use core verification logic instead of prefix-only checks, so validation matches actual core parsing/acceptance behavior.

• Settings UX (Meta Features)

  • Added an Age Key section with two entry points:
    • X25519
    • MLKEM768-X25519
  • Added helper dialog capabilities:
    • generate keypair
    • derive public key from secret
    • copy secret/public key
    • inline invalid-state feedback for secret/public fields

• Localization/resources

  • Added new Age helper strings across existing locale files.
  • Added non-translatable key-type labels in ui/settings/src/main/res/values/non-translatable.xml.

val keyPair = Clash.genX25519KeyPair()
val okSecret = Clash.veritySecretKeys(keyPair.secretKey)
val publicKey = Clash.toPublicKeys(keyPair.secretKey).firstOrNull()
val okPublic = Clash.verityPublicKeys(publicKey.orEmpty())

[Copilot]

Pull request overview

This PR ports the upstream “Age key helper” feature into Tabby, adding end-to-end support (native → JNI → Kotlin → settings UI) for generating Age keypairs (X25519 and MLKEM768-X25519), deriving public keys from secrets, and validating secret/public keys using core logic.

Changes:

• Added native/core exports + JNI + Kotlin bridge APIs for Age keypair generation, secret→public derivation, and key validation.
• Updated Age secret-key validation to rely on core verification instead of a prefix-only heuristic.
• Added a Meta Features “Age Key” settings section with a helper dialog and localized strings/resources.

Reviewed changes

Copilot reviewed 17 out of 17 changed files in this pull request and generated 12 comments.

Show a summary per file

File	Description
ui/settings/src/main/res/values/strings.xml	Adds Age Key helper UI strings (EN).
ui/settings/src/main/res/values/non-translatable.xml	Adds non-translatable key-type labels (X25519 / MLKEM768-X25519).
ui/settings/src/main/res/values-zh/strings.xml	Adds Age Key helper UI strings (ZH).
ui/settings/src/main/res/values-zh-rTW/strings.xml	Adds Age Key helper UI strings (ZH-TW).
ui/settings/src/main/res/values-zh-rHK/strings.xml	Adds Age Key helper UI strings (ZH-HK).
ui/settings/src/main/res/values-vi/strings.xml	Adds Age Key helper UI strings (VI).
ui/settings/src/main/res/values-ru/strings.xml	Adds Age Key helper UI strings (RU).
ui/settings/src/main/res/values-ko-rKR/strings.xml	Adds Age Key helper UI strings (KO-KR).
ui/settings/src/main/res/values-ja-rJP/strings.xml	Adds Age Key helper UI strings (JA-JP).
ui/settings/src/main/kotlin/com/github/kr328/clash/settings/ui/MetaFeatureSettingsScreen.kt	Adds settings entries + Compose dialog for generating/deriving/copying/validating keys.
glue/src/main/kotlin/com/github/kr328/clash/glue/util/Validator.kt	Switches Age secret key validator to core-based verification.
core/src/main/kotlin/com/github/kr328/clash/core/model/AgeKeyPair.kt	Introduces a typed model for decoded keypair results.
core/src/main/kotlin/com/github/kr328/clash/core/Clash.kt	Exposes high-level Kotlin APIs for keypair generation / validation / derivation.
core/src/main/kotlin/com/github/kr328/clash/core/bridge/Bridge.kt	Adds new JNI extern declarations for Age helper APIs.
core/src/main/golang/native/config/age.go	Adds Go-side wrappers for Age helper operations.
core/src/main/golang/native/config.go	Exports new cgo functions for JNI to call (generate/verify/derive).
core/src/main/cpp/main.c	Wires new exported native functions into JNI entry points.

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[Copilot]

Pull request overview

Copilot reviewed 17 out of 17 changed files in this pull request and generated 3 comments.