feat: Enhance security and validation in backend

- Added helmet for security headers and configured content security policy
- Implemented CORS with a whitelist for allowed origins
- Introduced express-validator for input validation in API endpoints
- Set request size limits to prevent DoS attacks
- Added global error handling and 404 response
- Updated TypeScript configuration to use node16 module resolution
- Improved Docker Compose configuration for security and resource limits
- Created a comprehensive .env.example for environment configuration
- Implemented automated security scans in CI/CD with Trivy
- Added cleanup script for debugging ports
- Established a detailed security policy document

.vscode/settings.json

@@ -1,28 +1,9 @@
 {
-  "typescript.preferences.includePackageJsonAutoImports": "auto",
-  "editor.formatOnSave": true,
-  "editor.defaultFormatter": "esbenp.prettier-vscode",
-  "editor.codeActionsOnSave": {
-    "source.fixAll.eslint": "explicit"
-  },
-  "files.exclude": {
-    "**/node_modules": true,
-    "**/dist": true,
-    "**/.git": true,
-    "**/.DS_Store": true
-  },
-  "search.exclude": {
-    "**/node_modules": true,
-    "**/dist": true
-  },
-  "typescript.updateImportsOnFileMove.enabled": "always",
-  "emmet.includeLanguages": {
-    "typescript": "typescriptreact"
-  },
-  "debug.allowBreakpointsEverywhere": true,
-  "debug.node.autoAttach": "on",
-  "terminal.integrated.enablePersistentSessions": false,
-  "terminal.integrated.confirmOnKill": "editor",
-  "task.autoDetect": "off",
-  "task.showDecorations": true
-}
+    "github.copilot.chat.languageContext.inline.typescript.enabled": true,
+    "github.copilot.chat.languageContext.fix.typescript.enabled": true,
+    "github.copilot.chat.edits.temporalContext.enabled": true,
+    "github.copilot.chat.completionContext.typescript.mode": "on",
+    "github.copilot.chat.agent.thinkingTool": true,
+    "github.copilot.chat.followUps": "always",
+    "debug.onTaskErrors": "abort"
+}