Comprehensive platform review: security fixes, query optimization, UI improvements, and code cleanup

Security (Critical/High):
- Fix path traversal bypass in local storage provider (path.resolve + prefix check)
- Fix timing-unsafe HMAC comparison (crypto.timingSafeEqual)
- Add auth + ownership checks to email API routes (verify-credentials, change-password)
- Remove hardcoded secret key fallback in local storage provider
- Add production credential check for MinIO (fail loudly if not set)
- Remove DB error details from health check response
- Add stricter rate limiting on application submissions (5/hour)
- Add rate limiting on email availability check (anti-enumeration)
- Change getAIAssignmentJobStatus to adminProcedure
- Block dangerous file extensions on upload
- Reduce project list max perPage from 5000 to 200

Query Optimization:
- Optimize analytics getProjectRankings with select instead of full includes
- Fix N+1 in mentor.getSuggestions (batch findMany instead of loop)
- Use _count for files instead of fetching full file records in project list
- Switch to bulk notifications in assignment and user bulk operations
- Batch filtering upserts (25 per transaction instead of all at once)

UI/UX:
- Replace Inter font with Montserrat in public layout (brand consistency)
- Use Logo component in public layout instead of placeholder
- Create branded 404 and error pages
- Make admin rounds table responsive with mobile card layout
- Fix notification bell paths to be role-aware
- Replace hardcoded slate colors with semantic tokens in admin sidebar
- Force light mode (dark mode untested)
- Adjust CardTitle default size
- Improve muted-foreground contrast for accessibility (A11Y)
- Move profile form state initialization to useEffect

Code Quality:
- Extract shared toProjectWithRelations to anonymization.ts (removed 3 duplicates)
- Remove dead code: getObjectInfo, isValidImageSize, unused batch tag functions, debug logs
- Remove unused twilio dependency
- Remove redundant email index from schema
- Add actual storage object deletion when file records are deleted
- Wrap evaluation submit + assignment update in
- Add comprehensive platform review document

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/(public)/layout.tsx

@@ -1,6 +1,4 @@
-import { Inter } from 'next/font/google'
-
-const inter = Inter({ subsets: ['latin'] })
+import { Logo } from '@/components/shared/logo'
 
 export default function PublicLayout({
   children,
@@ -8,14 +6,12 @@ export default function PublicLayout({
   children: React.ReactNode
 }) {
   return (
-    <div className={`min-h-screen bg-background ${inter.className}`}>
+    <div className="min-h-screen bg-background font-sans">
       {/* Simple header */}
       <header className="border-b bg-card">
         <div className="container mx-auto px-4 py-4">
           <div className="flex items-center gap-3">
-            <div className="h-8 w-8 rounded-lg bg-primary flex items-center justify-center">
-              <span className="text-sm font-bold text-white">M</span>
-            </div>
+            <Logo variant="small" />
             <span className="font-semibold">Monaco Ocean Protection Challenge</span>
           </div>
         </div>