[ci skip] f1-stream: replace Go service with Python/FastAPI skeleton

Replaces the existing Go-based f1-stream service with a new Python/FastAPI
backend as the foundation for the rebuilt F1 streaming aggregation service.

- New FastAPI backend with health and root endpoints
- Python 3.13 slim Dockerfile (replaces Go multi-stage build)
- Updated Terraform deployment (port 8000, reduced resources)
- Buildx-based redeploy.sh with --platform linux/amd64
- Added Woodpecker CI pipeline for automated builds
- Removed all old Go source, node_modules, static assets

stacks/f1-stream/files/backend/main.py

@@ -0,0 +1,19 @@
+from fastapi import FastAPI
+
+app = FastAPI(title="F1 Streams")
+
+
+@app.get("/health")
+async def health():
+    return {"status": "ok"}
+
+
+@app.get("/")
+async def root():
+    return {"service": "f1-streams", "version": "2.0.1"}
+
+
+if __name__ == "__main__":
+    import uvicorn
+
+    uvicorn.run(app, host="0.0.0.0", port=8000)

stacks/f1-stream/files/backend/requirements.txt

@@ -0,0 +1,2 @@
+fastapi==0.115.0
+uvicorn[standard]