Remove old requirements.txt files

backend/requirements-dev.txt

@@ -1,3 +0,0 @@
--r requirements.txt
-pytest==8.3.4
-httpx==0.28.1

backend/requirements.txt

@@ -1,25 +0,0 @@
-fastapi==0.115.12
-uvicorn==0.34.0
-yfinance==0.2.54
-feedparser==6.0.10
-legacy-cgi==2.6.2
-requests==2.31.0
-apscheduler==3.10.3
-pydantic==2.11.1
-pydantic-settings==2.8.1
-playwright==1.50.0
-playwright-stealth==1.0.6
-beautifulsoup4==4.13.3
-cachetools==5.5.2
-slowapi==0.1.9
-cloudscraper==1.2.71
-python-dotenv==1.0.1
-lxml==5.3.1
-reverse_geocoder==1.5.1
-sgp4==2.23
-geopy==2.4.1
-pytz==2024.2
-pystac-client==0.8.6
-pytest==8.3.4
-pytest-asyncio==0.25.0
-httpx==0.28.1