fix: align build config with SDK repo

- Add @types/node@24.10.0 (matches SDK, fixes Buffer/Uint8Array conflict)
- Switch bunfig.toml to linker=isolated (matches SDK)
- Remove skipLibCheck and preserveSymlinks workarounds from dts config

Root cause: @types/node@22.7.5 had incompatible Buffer types with
bun-types, resolved in @types/node@24.10.0.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: github-actions[bot]