Add Zod validation, fix mass assignment, remove test endpoints and dead code

- Add centralized Zod schemas (server/utils/schemas.js) and validateBody
  utility for all API endpoints
- Fix critical mass assignment in member creation: raw body no longer
  passed to new Member(), only validated fields (email, name, circle,
  contributionTier) are accepted
- Apply Zod validation to login, profile patch, event registration,
  updates, verify-payment, and admin event creation endpoints
- Fix logout cookie flags to match login (httpOnly: true, secure
  conditional on NODE_ENV)
- Delete unauthenticated test/debug endpoints (test-connection,
  test-subscription, test-bot)
- Remove sensitive console.log statements from Helcim and member
  endpoints
- Remove unused bcryptjs dependency
- Add 10MB file size limit on image uploads
- Use runtime config for JWT secret across all endpoints
- Add 38 validation tests (117 total, all passing)

server/api/events/[id]/register.post.js

@@ -2,6 +2,8 @@ import Event from "../../../models/event.js";
 import Member from "../../../models/member.js";
 import { connectDB } from "../../../utils/mongoose.js";
 import { sendEventRegistrationEmail } from "../../../utils/resend.js";
+import { validateBody } from "../../../utils/validateBody.js";
+import { eventRegistrationSchema } from "../../../utils/schemas.js";
 import mongoose from "mongoose";
 
 export default defineEventHandler(async (event) => {
@@ -9,7 +11,7 @@ export default defineEventHandler(async (event) => {
     // Ensure database connection
     await connectDB();
     const identifier = getRouterParam(event, "id");
-    const body = await readBody(event);
+    const body = await validateBody(event, eventRegistrationSchema);
 
     if (!identifier) {
       throw createError({
@@ -18,14 +20,6 @@ export default defineEventHandler(async (event) => {
       });
     }
 
-    // Validate required fields
-    if (!body.name || !body.email) {
-      throw createError({
-        statusCode: 400,
-        statusMessage: "Name and email are required",
-      });
-    }
-
     // Fetch the event - try by slug first, then by ID
     let eventData;