chore: synchronize pending app/backend updates and repository hygiene

Includes current frontend and backend work in progress and removes generated artifacts from tracking to keep the repository clean for дальнейшая разработка.

Co-authored-by: Cursor <[email protected]>

.gitignore

@@ -1,10 +1,50 @@
-node_modules
-.next
-dist
-build
-coverage
-*.tsbuildinfo
+# dependencies
+node_modules/
+
+# next.js
+.next/
+out/
+
+# production
+build/
+dist/
+
+# turbo
+.turbo/
+
+# logs
+*.log
 npm-debug.log*
 yarn-debug.log*
-yarn-error.log*
 pnpm-debug.log*
+
+# env files
+.env
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+# cache
+.cache/
+.parcel-cache/
+
+# coverage
+coverage/
+
+# typescript
+*.tsbuildinfo
+next-env.d.ts
+
+# IDE
+.idea/
+.vscode/
+
+# OS
+.DS_Store
+Thumbs.db
+
+# misc
+.vercel/
+tmp/
+temp/