Initial scaffold: image/ FastAPI app, models.yaml, docs

- image/ FastAPI app: /api/status, /api/swap, /api/swap/{id}/stream, /api/test-connection
- models.yaml: 5-model catalog (qwen3-vl, gemma4, qwen36, qwen3-235b-fp8, qwen25-72b)
- README, runbook, known-issues
- Dry-run swap verified against live Spark 1 (gemma4 currently loaded)

image/pyproject.toml

@@ -0,0 +1,22 @@
+[project]
+name = "spark-control"
+version = "0.1.0"
+description = "Web UI to swap vLLM models on a DGX Spark cluster"
+requires-python = ">=3.11"
+dependencies = [
+    "fastapi>=0.115",
+    "uvicorn[standard]>=0.32",
+    "pydantic>=2.9",
+    "pyyaml>=6.0",
+    "httpx>=0.27",
+]
+
+[build-system]
+requires = ["setuptools>=68"]
+build-backend = "setuptools.build_meta"
+
+[tool.setuptools]
+packages = ["app"]
+
+[tool.setuptools.package-data]
+app = ["static/*", "../models.yaml"]