Update all dependencies to latest versions

Backend (Python):
- fastapi: 0.109.0 → 0.124.0
- uvicorn: 0.27.0 → 0.38.0
- pydantic: 2.5.3 → 2.12.5
- google-api-python-client: 2.116.0 → 2.187.0
- google-auth: 2.27.0 → 2.41.1
- SQLAlchemy: 2.0.23 → 2.0.44
- cryptography: 41.0.7 → 46.0.3
- alembic: 1.13.1 → 1.16.5
- And 6 other packages updated

Frontend (Node.js):
- react: 18.3.1 → 19.2.1 (major)
- react-dom: 18.3.1 → 19.2.1 (major)
- vite: 5.4.21 → 7.2.7 (major)
- tailwindcss: 3.4.18 → 4.1.17 (major)
- i18next: 23.16.8 → 25.7.2 (major)
- And 5 other packages updated

Breaking changes handled:
- Updated postcss.config.js for Tailwind CSS 4
- Installed @tailwindcss/postcss package

Security:
- Fixed 2 moderate vulnerabilities in esbuild
- All security audits now pass

Testing:
- Backend verified: API running on port 8000
- Frontend verified: UI running on port 3000
- Full integration tested and working

Author: Rafael Teodoro

backend/requirements.txt

@@ -1,14 +1,14 @@
-fastapi==0.109.0
-uvicorn[standard]==0.27.0
-google-auth==2.27.0
-google-auth-oauthlib==1.2.0
-google-auth-httplib2==0.2.0
-google-api-python-client==2.116.0
-pydantic==2.5.3
-python-multipart==0.0.6
-aiofiles==23.2.1
-python-dotenv==1.0.0
-PyJWT==2.8.0
-sqlalchemy==2.0.23
-alembic==1.13.1
-cryptography==41.0.7
+fastapi==0.124.0
+uvicorn[standard]==0.38.0
+google-auth==2.41.1
+google-auth-oauthlib==1.2.3
+google-auth-httplib2==0.2.1
+google-api-python-client==2.187.0
+pydantic==2.12.5
+python-multipart==0.0.20
+aiofiles==25.1.0
+python-dotenv==1.2.1
+PyJWT==2.10.1
+sqlalchemy==2.0.44
+alembic==1.16.5
+cryptography==46.0.3