Add Zod validation to all API endpoints and remove debug test route

Adds schema-based input validation across helcim, events, members,
series, admin, and updates API endpoints. Removes the peer-support
debug test endpoint. Adds validation test coverage.

server/api/updates/[id].patch.js

@@ -26,7 +26,7 @@ export default defineEventHandler(async (event) => {
   }
 
   const id = getRouterParam(event, "id");
-  const body = await readBody(event);
+  const body = await validateBody(event, updatePatchSchema);
 
   try {
     const update = await Update.findById(id);