chore(deps): bump zod from 3.25.76 to 4.1.12

Bumps [zod](https://github.com/colinhacks/zod) from 3.25.76 to 4.1.12.
- [Release notes](https://github.com/colinhacks/zod/releases)
- [Commits](colinhacks/zod@v3.25.76...v4.1.12)

---
updated-dependencies:
- dependency-name: zod
  dependency-version: 4.1.12
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "@ai-sdk/provider-utils": "^3.0.10",
     "@ax-llm/ax": "14.0.36",
     "ai": "^5.0.50",
-    "zod": "^3.23.8"
+    "zod": "^4.1.12"
   },
   "bugs": {
     "url": "https://github.com/@ax-llm/ax/issues"