fix: support built-in localization runtime, preview, and builder hooks

[sekiroxxxx]

Summary

Provide CLI integration for packaged Localization extensions while preserving existing project-extension priority and upstream browser-preview behavior.

Changes

• Share packaged extension-root resolution and a guarded development override.
• Discover and reconcile the builtin Localization AssetDB mount with conflict checks and idempotent reconciliation.
• Load project and builtin Preview contributions with manifest-name de-duplication, owner-root validation, failure isolation and unload handling.
• Discover builtin Builder hook entries through the existing hook ABI and failure policy.

Verification

• Node.js 22.17: 5 targeted Jest suites, 31 tests passed.
• CLI compile and generate:dts:ci passed.
• Paired PinK client typecheck and core/extension compilation passed.
• The 16-file source/test diff excludes development docs, Golden capture tools and manual verification assets.

Remaining gates

This is a Draft PR. Matching PinK packaging and host integration must consume these CLI changes before release.
Real builtin cold-start, Browser Preview lifecycle, Builder/OpenPaaS execution and final package validation remain pending. Full disable, grants and legacy-copy ownership are not claimed complete.