refactor: rename project from wedding-photo-sharing to PicPeak

- Update Docker image names and network configurations
- Rename package.json project names to picpeak-backend/frontend
- Update CI/CD configurations (Drone CI and GitHub Actions)
- Update documentation and setup scripts
- Update application branding in source code
- Change default database name to picpeak
- Update PM2 ecosystem config

🤖 Generated with [Claude Code](https://claude.ai/code)

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

backend/package.json

@@ -1,7 +1,7 @@
 {
-  "name": "photo-sharing-backend",
+  "name": "picpeak-backend",
   "version": "1.0.0",
-  "description": "Backend for event photo sharing platform",
+  "description": "Backend for PicPeak event photo sharing platform",
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
@@ -29,7 +29,7 @@
     "joi": "^17.9.1",
     "jsonwebtoken": "^9.0.0",
     "knex": "^2.4.2",
-    "multer": "^1.4.5-lts.1",
+    "multer": "^2.0.1",
     "node-cron": "^3.0.2",
     "nodemailer": "^6.9.1",
     "react-i18next": "^15.6.0",
@@ -41,7 +41,7 @@
   "devDependencies": {
     "eslint": "^8.40.0",
     "jest": "^29.5.0",
-    "nodemon": "^2.0.22",
+    "nodemon": "^3.1.10",
     "supertest": "^6.3.3"
   }
 }