Add FastAPI application with Docker support

Dockerfile

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+FROM python:3.11-slim
+
+# Speed up installs
+ENV PIP_NO_CACHE_DIR=1 PIP_DISABLE_PIP_VERSION_CHECK=1
+
+# Install deps
+COPY requirements.txt .
+RUN pip install -r requirements.txt
+
+# Add app
+COPY app.py .
+
+# Hugging Face Spaces injects $PORT (e.g., 7860). Bind to it.
+ENV PORT=7860
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]

app.py

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+from fastapi import FastAPI
+from pydantic import BaseModel
+
+app = FastAPI(title="Hello API")
+
+class Prompt(BaseModel):
+    text: str
+
+@app.get("/")
+def root():
+    return {"ok": True, "message": "API is live"}
+
+@app.post("/echo")
+def echo(p: Prompt):
+    # do your logic here
+    return {"length": len(p.text), "upper": p.text.upper()}

requirements.txt

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+fastapi
+uvicorn