chore(deps): relax zod peer dependency to support v3.25.0+

Since we no longer use z.fromJSONSchema(), we can support Zod v3.25.0+
instead of requiring v4.3.0+. This matches the main branch and allows
users with older Zod versions to use this package.

Author: ryoppippi

pnpm-workspace.yaml

@@ -37,7 +37,7 @@ catalogs:
     '@anthropic-ai/sdk': ^0.52.0
     ai: '>=5.0.108 <7.0.0'
     openai: ^6.2.0
-    zod: '>=4.3.0 <5'
+    zod: '>=3.25.0 <5'
   prod:
     '@modelcontextprotocol/sdk': ^1.24.3
     '@orama/orama': ^3.1.11