fix(core): support Zod imports under Bun Vitest

[M-DGayle]

Summary

Use Zod's namespace import in the core app-catalog schema so the schema loads when Vitest runs directly on Bun.

Motivation

The repository pins Bun 1.3.10. In a Bun-only Linux environment, Vitest 4.0.18 resolves Zod's named z export as undefined, so catalog.test.ts aborts during module evaluation at z.object() and none of its 20 tests run.

Zod's namespace export works in that same environment and under Node. The runtime schema behavior is unchanged; this only uses the interoperable ESM import form.

Related issue

None.

Changes

• packages/core: import Zod as a namespace in src/apps/schema.ts.
• No dependency, lockfile, schema, API, or generated-file changes.

Verification

Before the change, using the repository's pinned Bun version:

$ bun run --cwd packages/core test
Test Files  1 failed | 26 passed (27)
Tests       237 passed (237)
TypeError: undefined is not an object (evaluating '__vite_ssr_import_0__.z.object')

After the change:

$ bun run --cwd packages/core test
Test Files  27 passed (27)
Tests       257 passed (257)

$ bun run --cwd packages/core lint
$ tsc --noEmit

$ node /workspace/node_modules/vitest/vitest.mjs run  # Node 24
Test Files  27 passed (27)
Tests       257 passed (257)

$ bun run --cwd apps/api test  # Node 24 + Bun 1.3.10
Test Files  148 passed | 4 skipped (152)
Tests       1524 passed | 15 skipped (1539)

I also ran the root test command in Linux Docker. The changed core suite passed, but the root command is not green in a container because existing @repo/adapters and @repo/db tests assume /.dockerenv is absent and /etc/machine-id is stable. Those failures reproduce independently of this one-line change.

prettier --check packages/core/src/apps/schema.ts reports an existing formatting mismatch on both untouched main and this branch. git diff --check passes, and I left the unrelated formatting untouched.

Checklist

• One change per PR — one bug, or one agreed feature, with nothing unrelated bundled in
• The diff is scoped — no reformatting or lint fixes on lines I wasn't otherwise changing
• A test fails without this change and passes with it (or I explained above why there isn't one)
• bun run test, bun run --cwd <workspace> lint, and bun format all pass locally — targeted lint/tests pass; root/container and pre-existing formatting limitations are documented above
• I understand every line of this diff and can explain it in review