Add Swagger UI api page on Automation page

tests/test_http_quality.py

@@ -11,3 +11,41 @@ def test_openapi_json_is_gzipped_when_client_accepts_gzip():
 
     assert response.status_code == 200
     assert response.headers["content-encoding"] == "gzip"
+
+
+def test_custom_swagger_docs_page_is_served():
+    with TestClient(app) as client:
+        response = client.get("/docs")
+
+    assert response.status_code == 200
+    assert "RemoteTerm API" in response.text
+    assert "SwaggerUIBundle" in response.text
+    assert 'url: "openapi.json"' in response.text
+    assert 'href="api/health"' in response.text
+    assert "repeating-linear-gradient" not in response.text
+    assert "background-size: 32px 32px" not in response.text
+
+
+def test_openapi_includes_docs_metadata():
+    with TestClient(app) as client:
+        response = client.get("/openapi.json")
+
+    assert response.status_code == 200
+    data = response.json()
+    assert data["info"]["description"].startswith("RemoteTerm exposes")
+    assert "/docs" not in data["paths"]
+    tags = {tag["name"]: tag["description"] for tag in data["tags"]}
+    assert tags["messages"].startswith("Message history")
+    assert tags["radio"].startswith("Radio configuration")
+
+
+def test_openapi_documents_common_error_responses():
+    with TestClient(app) as client:
+        response = client.get("/openapi.json")
+
+    assert response.status_code == 200
+    data = response.json()
+    responses = data["paths"]["/api/messages/channel"]["post"]["responses"]
+    assert responses["400"]["description"] == "Bad request"
+    assert responses["423"]["description"] == "Radio unavailable or locked"
+    assert responses["500"]["description"] == "Server error"