feat: add demo app

Dockerfile

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+FROM python:3.11-alpine
+WORKDIR /app
+COPY app.py .
+EXPOSE 8080
+CMD ["python", "app.py"]

README.md

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+# demo-app
+
+Minimal Python HTTP service used to validate the Gitea -> Tekton -> Harbor flow.
+
+## Local Test
+
+```bash
+docker build -t demo-app:local .
+docker run --rm -p 8080:8080 demo-app:local
+curl http://127.0.0.1:8080/
+```

app.py

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+from http.server import BaseHTTPRequestHandler, HTTPServer
+import json
+
+
+class Handler(BaseHTTPRequestHandler):
+    def do_GET(self):
+        payload = {
+            "app": "demo-app",
+            "status": "ok",
+            "path": self.path,
+        }
+        body = json.dumps(payload).encode("utf-8")
+        self.send_response(200)
+        self.send_header("Content-Type", "application/json")
+        self.send_header("Content-Length", str(len(body)))
+        self.end_headers()
+        self.wfile.write(body)
+
+
+if __name__ == "__main__":
+    server = HTTPServer(("0.0.0.0", 8080), Handler)
+    server.serve_forever()