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/server/routers/settings.ts

@@ -3,6 +3,7 @@ import { router, adminProcedure, superAdminProcedure, protectedProcedure } from
 import { getWhatsAppProvider, getWhatsAppProviderType } from '@/lib/whatsapp'
 import { listAvailableModels, testOpenAIConnection, isReasoningModel } from '@/lib/openai'
 import { getAIUsageStats, getCurrentMonthCost, formatCost } from '@/server/utils/ai-usage'
+import { clearStorageProviderCache } from '@/lib/storage'
 
 /**
  * Categorize an OpenAI model for display
@@ -117,6 +118,11 @@ export const settingsRouter = router({
         },
       })
 
+      // Clear storage provider cache when storage_provider setting changes
+      if (input.key === 'storage_provider') {
+        clearStorageProviderCache()
+      }
+
       // Audit log (don't log actual value for secrets)
       await ctx.prisma.auditLog.create({
         data: {
@@ -181,6 +187,11 @@ export const settingsRouter = router({
         )
       )
 
+      // Clear storage provider cache if storage_provider was updated
+      if (input.settings.some((s) => s.key === 'storage_provider')) {
+        clearStorageProviderCache()
+      }
+
       // Audit log
       await ctx.prisma.auditLog.create({
         data: {