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/members/me/peer-support.patch.js

@@ -25,7 +25,7 @@ export default defineEventHandler(async (event) => {
     });
   }
 
-  const body = await readBody(event);
+  const body = await validateBody(event, peerSupportUpdateSchema);
 
   // Build update object for peer support settings
   const updateData = {