chore(repo): rimuove src/backend_temp/requirements.txt (#38)

Residuo pre-monorepo, dipendenze già in pyproject.toml (extra server).
Nessun riferimento altrove nel repo.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/backend_temp/requirements.txt

@@ -1,37 +0,0 @@
-# FastAPI + ASGI
-fastapi>=0.110.0
-uvicorn[standard]>=0.30.0
-
-# Database
-sqlalchemy[asyncio]>=2.0.0
-asyncmy>=0.2.0
-alembic>=1.13.0
-
-# Validation
-pydantic>=2.0.0
-pydantic-settings>=2.0.0
-
-# Security
-bcrypt>=4.0.0
-
-# File handling
-pillow>=10.0.0
-python-multipart>=0.0.6
-
-# Templating (setup page)
-jinja2>=3.1.0
-
-# Reports
-plotly>=5.0.0
-kaleido>=0.2.0
-weasyprint>=62.0
-
-# Utilities
-python-dotenv>=1.0.0
-
-# Testing
-pytest>=8.0.0
-pytest-asyncio>=0.23.0
-httpx>=0.27.0
-aiosqlite>=0.20.0
-coverage>=7.0.0