chore: update wallet service to use venv python and add requirements.txt

apps/wallet/requirements.txt

@@ -0,0 +1,10 @@
+fastapi>=0.111.0
+uvicorn[standard]>=0.30.0
+pydantic>=2.7.0
+pydantic-settings>=2.2.1
+sqlalchemy[asyncio]>=2.0.47
+aiosqlite>=0.20.0
+sqlmodel>=0.0.16
+httpx>=0.27.0
+python-dotenv>=1.0.1
+asyncpg>=0.29.0