fix: security and code quality improvements

Security fixes:
- Add file upload size limits (10MB) for customer and product imports
- Add XLSX file validation with row limits and magic byte checking
- Implement password validation (min 6 chars) in registration
- Add rate limiting for guest login (5 per IP per 15 minutes)
- Sanitize error messages to prevent information leakage
- Fix XSS vulnerability by removing unsafe v-html usage
- Enforce WhatsApp webhook signature verification
- Add SSRF protection with URL validation and IP blocking
- Fix marketing endpoints to use proper authentication

Code quality improvements:
- Create shared utility functions for UUID validation and string sanitization
- Remove duplicate UUID validation code from admin modules
- Remove dead code (pass statement in translation.py)
- Fix aliyun SDK import compatibility

admin-frontend/package.json

@@ -9,16 +9,17 @@
     "preview": "vite preview"
   },
   "dependencies": {
-    "vue": "^3.5.13",
-    "vue-router": "^4.5.0",
-    "element-plus": "^2.9.1",
     "@element-plus/icons-vue": "^2.3.1",
     "axios": "^1.7.9",
+    "dayjs": "^1.11.13",
+    "element-plus": "^2.9.1",
     "pinia": "^2.3.0",
-    "dayjs": "^1.11.13"
+    "vue": "^3.5.13",
+    "vue-router": "^4.5.0"
   },
   "devDependencies": {
     "@vitejs/plugin-vue": "^5.2.1",
+    "playwright": "^1.60.0",
     "vite": "^6.0.7"
   }
 }