Create simplified FastAPI app following modern practices

app.py

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+from fastapi import FastAPI
+import uvicorn
+
+# Create a FastAPI app for Hugging Face Spaces
+app = FastAPI(title="Collinear API")
+
+@app.get("/")
+async def root():
+    return {"message": "Welcome to Collinear API"}
+
+@app.get("/health")
+async def health():
+    return {"status": "healthy"}
+
+# Add more API endpoints here as needed
+@app.get("/api/datasets")
+async def list_datasets():
+    return {
+        "datasets": [
+            {"id": "1", "name": "Sample Dataset 1", "description": "Example dataset for demonstration"},
+            {"id": "2", "name": "Sample Dataset 2", "description": "Another example dataset"}
+        ]
+    }
+
+if __name__ == "__main__":
+    # This is used when running locally
+    uvicorn.run("app:app", host="0.0.0.0", port=7860, reload=True)