fix: add httpx and websockets to runtime dependencies (fixes #37)

Both were missing from [project.dependencies] in pyproject.toml and
requirements.txt. httpx is used in web/routers/art.py, and websockets
is needed for the FastAPI WebSocket endpoints in ws.py and lobby.py.

Closes #37

pyproject.toml

@@ -14,6 +14,8 @@ dependencies = [
     "fastapi>=0.100.0",
     "uvicorn[standard]>=0.23.0",
     "pydantic>=2.0.0",
+    "httpx>=0.24.0",
+    "websockets>=11.0",
 ]
 
 [project.optional-dependencies]

requirements.txt

@@ -5,3 +5,5 @@
 fastapi>=0.100.0
 uvicorn[standard]>=0.23.0
 pydantic>=2.0.0
+httpx>=0.24.0
+websockets>=11.0