New Dockerfile, still dummy app, testing minimal req file. v4

requirements.txt

@@ -1,12 +1,2 @@
 fastapi==0.115.5
-uvicorn==0.32.1
-pydantic==2.10.2
-python-dotenv==1.0.1
-PyYAML==6.0.2
-starlette==0.41.3
-typing_extensions==4.12.2
-anyio==4.6.2.post1
-click==8.1.7
-h11==0.14.0
-idna==3.10
-sniffio==1.3.1
+uvicorn==0.32.1