docs: Add comprehensive deployment guide

📝 Created DEPLOYMENT_GUIDE.md:
- Step-by-step server deployment process
- Cache clearing procedures (OPcache, WordPress, Browser)
- File verification commands
- Endpoint testing procedures
- Common issues & solutions
- Verification checklist
- Rollback procedure
- Production checklist

🎯 Covers All Common Issues:
1. SPA not loading (dev mode detection)
2. API 500 errors (namespace case)
3. WordPress media not loading (standalone)
4. Changes not reflecting (cache layers)

✅ Ready for Server Deployment!

DEPLOYMENT_GUIDE.md

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+# Deployment Guide
+
+## Server Deployment Steps
+
+### 1. Pull Latest Code
+```bash
+cd /home/dewepw/woonoow.dewe.pw/wp-content/plugins/woonoow
+git pull origin main
+```
+
+### 2. Clear All Caches
+
+#### WordPress Object Cache
+```bash
+wp cache flush
+```
+
+#### OPcache (PHP)
+Create a file `clear-opcache.php` in plugin root:
+```php
+<?php
+if (function_exists('opcache_reset')) {
+    opcache_reset();
+    echo "OPcache cleared!";
+} else {
+    echo "OPcache not available";
+}
+```
+
+Then visit: `https://woonoow.dewe.pw/wp-content/plugins/woonoow/clear-opcache.php`
+
+Or via command line:
+```bash
+php -r "opcache_reset();"
+```
+
+#### Browser Cache
+- Hard refresh: `Ctrl+Shift+R` (Windows/Linux) or `Cmd+Shift+R` (Mac)
+- Or clear browser cache completely
+
+### 3. Verify Files
+```bash
+# Check if Routes.php has correct namespace
+grep "use WooNooW" includes/Api/Routes.php
+
+# Should show:
+# use WooNooW\Api\PaymentsController;
+# use WooNooW\Api\StoreController;
+# use WooNooW\Api\DeveloperController;
+# use WooNooW\Api\SystemController;
+
+# Check if Assets.php has correct is_dev_mode()
+grep -A 5 "is_dev_mode" includes/Admin/Assets.php
+
+# Should show:
+# defined('WOONOOW_ADMIN_DEV') && WOONOOW_ADMIN_DEV === true
+```
+
+### 4. Check File Permissions
+```bash
+# Plugin files should be readable
+find . -type f -exec chmod 644 {} \;
+find . -type d -exec chmod 755 {} \;
+```
+
+### 5. Test Endpoints
+
+#### Test API
+```bash
+curl -I https://woonoow.dewe.pw/wp-json/woonoow/v1/store/settings
+```
+
+Should return `200 OK`, not `500 Internal Server Error`.
+
+#### Test Admin SPA
+Visit: `https://woonoow.dewe.pw/wp-admin/admin.php?page=woonoow`
+
+Should load the SPA, not show blank page or errors.
+
+#### Test Standalone
+Visit: `https://woonoow.dewe.pw/admin`
+
+Should load standalone admin interface.
+
+---
+
+## Common Issues & Solutions
+
+### Issue 1: SPA Not Loading (Blank Page)
+
+**Symptoms:**
+- Blank page in wp-admin
+- Console errors about `@react-refresh` or `localhost:5173`
+
+**Cause:**
+- Server is in dev mode
+- Trying to load from Vite dev server
+
+**Solution:**
+```bash
+# Check wp-config.php - remove or set to false:
+define('WOONOOW_ADMIN_DEV', false);
+
+# Or remove the line completely
+```
+
+### Issue 2: API 500 Errors
+
+**Symptoms:**
+- All API endpoints return 500
+- Error: `Class "WooNooWAPIPaymentsController" not found`
+
+**Cause:**
+- Namespace case mismatch
+- Old code cached
+
+**Solution:**
+```bash
+# 1. Pull latest code
+git pull origin main
+
+# 2. Clear OPcache
+php -r "opcache_reset();"
+
+# 3. Clear WordPress cache
+wp cache flush
+
+# 4. Verify namespace fix
+grep "use WooNooW\\\\Api" includes/Api/Routes.php
+```
+
+### Issue 3: WordPress Media Not Loading (Standalone)
+
+**Symptoms:**
+- "WordPress Media library is not loaded" error
+- Image upload doesn't work
+
+**Cause:**
+- Missing wp.media scripts
+
+**Solution:**
+- Already fixed in latest code
+- Pull latest: `git pull origin main`
+- Clear cache
+
+### Issue 4: Changes Not Reflecting
+
+**Symptoms:**
+- Code changes don't appear
+- Still seeing old errors
+
+**Cause:**
+- Multiple cache layers
+
+**Solution:**
+```bash
+# 1. Clear PHP OPcache
+php -r "opcache_reset();"
+
+# 2. Clear WordPress object cache
+wp cache flush
+
+# 3. Clear browser cache
+# Hard refresh: Ctrl+Shift+R
+
+# 4. Restart PHP-FPM (if needed)
+sudo systemctl restart php8.1-fpm
+# or
+sudo systemctl restart php-fpm
+```
+
+---
+
+## Verification Checklist
+
+After deployment, verify:
+
+- [ ] Git pull completed successfully
+- [ ] OPcache cleared
+- [ ] WordPress cache cleared
+- [ ] Browser cache cleared
+- [ ] API endpoints return 200 OK
+- [ ] WP-Admin SPA loads correctly
+- [ ] Standalone admin loads correctly
+- [ ] No console errors
+- [ ] Dashboard displays data
+- [ ] Settings pages work
+- [ ] Image upload works
+
+---
+
+## Rollback Procedure
+
+If deployment causes issues:
+
+```bash
+# 1. Check recent commits
+git log --oneline -5
+
+# 2. Rollback to previous commit
+git reset --hard <commit-hash>
+
+# 3. Clear caches
+php -r "opcache_reset();"
+wp cache flush
+
+# 4. Verify
+curl -I https://woonoow.dewe.pw/wp-json/woonoow/v1/store/settings
+```
+
+---
+
+## Production Checklist
+
+Before going live:
+
+- [ ] All features tested
+- [ ] No console errors
+- [ ] No PHP errors in logs
+- [ ] Performance tested
+- [ ] Security reviewed
+- [ ] Backup created
+- [ ] Rollback plan ready
+- [ ] Monitoring in place
+
+---
+
+## Support
+
+If issues persist:
+1. Check error logs: `/home/dewepw/woonoow.dewe.pw/wp-content/debug.log`
+2. Check PHP error logs: `/var/log/php-fpm/error.log`
+3. Enable WP_DEBUG temporarily to see detailed errors
+4. Contact development team with error details