docs: consolidate audit and analysis reports into docs/audits/

Move 36 root-level audit/analysis documents and 7 web app audit documents
into docs/audits/ directory to declutter the project root. Remove stale
EXPLORATION_SUMMARY.txt.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

docs/audits/WEB_UPGRADE_CHECKLIST.md

@@ -0,0 +1,196 @@
+# Next.js 14.2.35 → 15 Upgrade Checklist
+
+## ✅ Pre-Upgrade Verification
+
+- [ ] Create feature branch: `git checkout -b upgrade/next-15`
+- [ ] Commit current work: `git add . && git commit -m "Pre-upgrade checkpoint"`
+- [ ] Run full test suite: `npm run test`
+- [ ] Check TypeScript: `npm run typecheck`
+- [ ] Note current version: `npm ls next` (should be 14.2.35)
+
+## 🔧 Upgrade Steps
+
+### Step 1: Update Next.js
+```bash
+npm install next@15 --save
+npm install
+```
+
+### Step 2: Run Development Server
+```bash
+npm run dev
+```
+- [ ] Dev server starts without errors
+- [ ] No TypeScript errors
+- [ ] HMR (hot reload) working
+
+### Step 3: Type Checking
+```bash
+npm run typecheck
+```
+- [ ] No new type errors introduced
+- [ ] All types resolve correctly
+
+### Step 4: Run Tests
+```bash
+npm run test
+```
+- [ ] All tests pass
+- [ ] No test breakage
+- [ ] Coverage maintained
+
+### Step 5: Production Build
+```bash
+npm run build
+```
+- [ ] Build completes successfully
+- [ ] Build size similar to before (within ±5%)
+- [ ] No build warnings
+- [ ] Check `.next` directory size: `du -sh .next/`
+
+### Step 6: Test Production Build
+```bash
+npm run start
+```
+- [ ] Production build starts
+- [ ] No runtime errors
+- [ ] Can navigate application
+
+## 🧪 Manual Testing Checklist
+
+### Public Pages
+- [ ] Home page loads and renders
+- [ ] Search page loads (with map)
+- [ ] Listing detail page loads with images
+- [ ] Image gallery works (previous/next buttons)
+
+### Authentication
+- [ ] Login page loads
+- [ ] Register page loads
+- [ ] Auth callbacks work (Google, Zalo)
+- [ ] Cookies set/cleared correctly
+- [ ] Redirect to login works for protected pages
+
+### Internationalization (i18n)
+- [ ] English version loads: `/en/*`
+- [ ] Vietnamese version loads: `/vi/*`
+- [ ] Locale switching works
+- [ ] Language preference persists
+- [ ] Middleware locale detection works
+
+### Dashboard (Protected)
+- [ ] Dashboard page loads
+- [ ] Listings page works
+- [ ] Create new listing flow
+- [ ] Edit listing flow
+- [ ] Payments/Subscription pages load
+- [ ] Profile page loads
+- [ ] KYC page loads
+- [ ] Valuation page loads
+
+### Admin Panel
+- [ ] Admin dashboard loads
+- [ ] Users page loads
+- [ ] KYC review page loads
+- [ ] Moderation page loads
+
+### Performance
+- [ ] Page load times reasonable
+- [ ] No console errors
+- [ ] No console warnings
+- [ ] No memory leaks detected
+- [ ] Network requests functioning
+
+### Special Features
+- [ ] Mapbox GL maps load correctly
+- [ ] Image optimization working
+- [ ] CSP headers correct
+- [ ] Sentry error tracking working
+- [ ] Web vitals reporting working
+
+## 📊 Performance Baseline
+
+Before upgrade:
+- Build time: _____ seconds
+- Bundle size: _____ MB
+- First contentful paint: _____ ms
+- Time to interactive: _____ ms
+
+After upgrade:
+- Build time: _____ seconds
+- Bundle size: _____ MB
+- First contentful paint: _____ ms
+- Time to interactive: _____ ms
+
+Comparison: _____ (Improvement/No change/Slight increase)
+
+## 🔍 Compatibility Checks
+
+### Dependencies Status
+- [ ] @sentry/nextjs@10.47.0 → Working
+- [ ] next-intl@4.9.0 → Working
+- [ ] @tanstack/react-query@5.96.2 → Working
+- [ ] mapbox-gl@3.21.0 → Maps loading correctly
+- [ ] All other dependencies → Compatible
+
+### Configuration Files
+- [ ] next.config.js → No warnings
+- [ ] tsconfig.json → Valid
+- [ ] tailwind.config.ts → Building correctly
+- [ ] sentry.*.config.ts → Error tracking working
+
+## 🚀 Deployment
+
+### Staging Environment
+- [ ] Deploy to staging
+- [ ] Full test suite passes in staging
+- [ ] Manual smoke testing completed
+- [ ] Monitor logs for 30 minutes
+- [ ] No errors in error tracking
+
+### Production Environment
+- [ ] Create production deployment branch
+- [ ] Deploy to production
+- [ ] Monitor error logs
+- [ ] Monitor performance metrics
+- [ ] Check Sentry for new errors
+- [ ] Verify all features working
+- [ ] Monitor for 24 hours
+
+## ✅ Post-Upgrade Sign-Off
+
+- [ ] All tests passing
+- [ ] Build size acceptable
+- [ ] Performance acceptable
+- [ ] No critical errors
+- [ ] Feature parity maintained
+- [ ] Ready for production
+
+## 📝 Notes & Issues Found
+
+```
+Issue 1: ___________________________________________
+Resolution: ________________________________________
+
+Issue 2: ___________________________________________
+Resolution: ________________________________________
+
+Issue 3: ___________________________________________
+Resolution: ________________________________________
+```
+
+## 🎯 Sign-Off
+
+Upgraded by: _____________________
+Date: _____________________
+Verified by: _____________________
+Production deployed: _____________________
+
+---
+
+**If any issues occur, revert with:**
+```bash
+git revert HEAD
+npm install
+npm run dev
+```