Add Gemini text-generation sample using official SDK

[Copilot]

The task requires demonstrating Gemini text generation per the official docs (zh-CN), configuring the API key and invoking a model to produce text.

• Gemini SDK integration
  • Add google-generativeai dependency.
  • Configure client with GEMINI_API_KEY, fail fast with a clear error if unset.
• Sample text generation
  • Instantiate gemini-1.5-flash and print generated text for a simple prompt.

Example:

import google.generativeai as genai
import os

api_key = os.environ.get("GEMINI_API_KEY")
if not api_key:
    raise EnvironmentError("Set the GEMINI_API_KEY environment variable to call Gemini API.")

genai.configure(api_key=api_key)
model = genai.GenerativeModel("gemini-1.5-flash")
print(model.generate_content("Write a story about a magic backpack.").text)

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• ai.google.dev
  • Triggering command: /usr/bin/python python - (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

https://ai.google.dev/gemini-api/docs/text-generation?hl=zh-cn

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