MCP Server: Support nested array schemas in OpenApiValidator

The OpenApiValidator.mjs within the MCP Server infrastructure currently forces all arrays defined in openapi.yaml to be mapped to z.array(z.string()).

While this handles simple arrays, it causes a ZodError for tools that require an array of objects (e.g., simulateEvent, which expects an array of event objects like { type: "click", targetId: "test" }).

We need to enhance buildZodSchema to introspect the items property of the array schema and properly map nested structures like objects to z.object() instead of defaulting all arrays to strings. This will support more robust complex payloads passed over the bridge via MCP tools.