[Feature] Add Support for Poe API

[zerob13]

Is your feature request related to a problem? Please describe.
The application currently lacks support for the Poe OpenAI-compatible API provider. Poe enables access to a wide range of models and bots through a single key using the familiar /v1/chat/completions interface. Without this provider, users cannot conveniently leverage Poe’s unified access to multiple frontier models or quickly switch and compare them within the application.

Describe the solution you'd like
I would like to request the addition of Poe as a new provider. Poe offers an OpenAI-compatible API for chat completions, which should make the integration process straightforward. The key information for the provider would be:

• Provider Name: Poe
• API Base URL: https://api.poe.com/v1
• Authentication: Bearer Token using POE_API_KEY (obtainable at https://poe.com/api_key)

Below is a sample Python snippet using the OpenAI SDK (compatible with Poe’s API):

# pip install openai
import os, openai
client = openai.OpenAI(
    api_key=os.getenv("POE_API_KEY"), # https://poe.com/api_key
    base_url="https://api.poe.com/v1",
)
chat = client.chat.completions.create(
    model="GPT-4o",  # or other models (Claude-Sonnet-4, Gemini-2.5-Pro, Llama-3.1-405B, Grok-4..)
    messages=[{"role": "user", "content": "Top 3 things to do in NYC?"}],
)
print(chat.choices[0].message.content)

Describe alternatives you've considered
Using individual providers’ native APIs for each model. However, this leads to fragmented configurations and higher integration overhead. Poe’s OpenAI-compatible endpoint provides a unified way to access multiple models with one key and a consistent interface, reducing complexity.

Additional context
Poe’s OpenAI-compatible API documentation:
https://creator.poe.com/docs/external-applications/openai-compatible-api

---

你的功能请求是否与某个问题有关？请描述一下。
当前应用不支持 Poe 的 API 作为 provider。Poe 通过统一的 /v1/chat/completions 接口与单一密钥，提供对多种模型的访问。如果缺少该 provider，用户无法便捷地利用 Poe 的多模型统一接入能力，也不便于在应用内快速切换与比较不同前沿模型。

请描述你希望的解决方案
希望添加 Poe 作为新的 Provider。Poe 提供与 OpenAI 兼容的聊天补全 API，集成应当较为简单。关键配置信息如下：

• Provider 名称：Poe
• API Base URL：https://api.poe.com/v1
• 认证方式：使用 POE_API_KEY 进行 Bearer Token 认证（可在 https://poe.com/api_key 获取）

以下是一个使用 OpenAI SDK（兼容 Poe API）的 Python 示例代码：

# pip install openai
import os, openai
client = openai.OpenAI(
    api_key=os.getenv("POE_API_KEY"), # https://poe.com/api_key
    base_url="https://api.poe.com/v1",
)
chat = client.chat.completions.create(
    model="GPT-4o",  # 或其他模型（Claude-Sonnet-4, Gemini-2.5-Pro, Llama-3.1-405B, Grok-4..）
    messages=[{"role": "user", "content": "纽约值得做的三件事？"}],
)
print(chat.choices[0].message.content)

请描述你考虑过的其他替代方案
为每个模型分别对接其原生 API。但这会导致配置分散、集成成本提高。Poe 的 OpenAI 兼容端点提供统一接口，使用单密钥即可访问多模型，显著降低复杂度。

附加背景
Poe 的 OpenAI 兼容 API 文档：
https://creator.poe.com/docs/external-applications/openai-compatible-api

[zerob13]

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