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/lib/minio.ts

@@ -15,12 +15,18 @@ export const MINIO_PUBLIC_ENDPOINT = process.env.MINIO_PUBLIC_ENDPOINT || MINIO_
 function createMinioClient(): Minio.Client {
   const url = new URL(MINIO_ENDPOINT)
 
+  const accessKey = process.env.MINIO_ACCESS_KEY
+  const secretKey = process.env.MINIO_SECRET_KEY
+  if (process.env.NODE_ENV === 'production' && (!accessKey || !secretKey)) {
+    throw new Error('MINIO_ACCESS_KEY and MINIO_SECRET_KEY environment variables are required in production')
+  }
+
   return new Minio.Client({
     endPoint: url.hostname,
     port: url.port ? parseInt(url.port) : (url.protocol === 'https:' ? 443 : 80),
     useSSL: url.protocol === 'https:',
-    accessKey: process.env.MINIO_ACCESS_KEY || 'minioadmin',
-    secretKey: process.env.MINIO_SECRET_KEY || 'minioadmin',
+    accessKey: accessKey || 'minioadmin',
+    secretKey: secretKey || 'minioadmin',
   })
 }
 
@@ -109,12 +115,3 @@ export function generateObjectKey(
   return `projects/${projectId}/${timestamp}-${sanitizedName}`
 }
 
-/**
- * Get file metadata from MinIO
- */
-export async function getObjectInfo(
-  bucket: string,
-  objectKey: string
-): Promise<Minio.BucketItemStat> {
-  return minio.statObject(bucket, objectKey)
-}