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/auth/verify.get.js

@@ -18,8 +18,9 @@ export default defineEventHandler(async (event) => {
   }
   
   try {
-    // Verify the JWT token
-    const decoded = jwt.verify(token, process.env.JWT_SECRET)
+    // Verify the JWT token (use runtime config for consistency with login/requireAuth)
+    const config = useRuntimeConfig(event)
+    const decoded = jwt.verify(token, config.jwtSecret)
     const member = await Member.findById(decoded.memberId)
     
     if (!member) {
@@ -32,7 +33,7 @@ export default defineEventHandler(async (event) => {
     // Create a new session token for the authenticated user
     const sessionToken = jwt.sign(
       { memberId: member._id, email: member.email },
-      process.env.JWT_SECRET,
+      config.jwtSecret,
       { expiresIn: '7d' }
     )