Update manifest.json with new file metadata and add pytest configuration

- Updated timestamps and AST hashes for multiple files in the manifest.json.
- Added new test file backend/tests/test_expected_income.py.
- Added documentation files: перево́д_между_своими.md and 0002-fixes.md.
- Introduced pytest.ini to configure pytest settings, including test paths and warning filters.

frontend/package.json

@@ -16,6 +16,7 @@
   "dependencies": {
     "@fontsource/funnel-sans": "^5.3.0",
     "@fontsource/geist-mono": "^5.3.0",
+    "@fontsource/onest": "^5.3.1",
     "@hookform/resolvers": "^5.1.0",
     "@tanstack/react-query": "^5.80.0",
     "i18next": "^25.2.0",