feat: add Avian as LLM provider

[avianion]

Summary

Add Avian as an LLM provider option in FastGPT. Avian offers an OpenAI-compatible API with access to leading open-source models at competitive prices.

Changes

• Icon: Add Avian SVG icon (packages/web/components/common/Icon/icons/model/avian.svg) and register it in icon constants
• Documentation: Add English and Chinese docs for configuring Avian as a model provider via AI Proxy
• Meta: Update model config documentation navigation to include Avian

Avian Provider Details

• API Base URL: https://api.avian.io/v1
• Auth: Bearer token (OpenAI-compatible Authorization: Bearer header)
• Supported features: Chat completions, streaming, function calling

Available Models

Model	Context	Output	Input Price	Output Price
deepseek/deepseek-v3.2	164K	65K	$0.26/1M	$0.38/1M
moonshotai/kimi-k2.5	131K	8K	$0.45/1M	$2.20/1M
z-ai/glm-5	131K	16K	$0.30/1M	$2.55/1M
minimax/minimax-m2.5	1M	1M	$0.30/1M	$1.10/1M

Integration

Since Avian uses an OpenAI-compatible API, users can configure it via AI Proxy by selecting the OpenAI provider type and setting the base URL to https://api.avian.io/v1. The documentation guides users through both AI Proxy and environment variable configuration methods.

Test Plan

• Verify the Avian icon renders correctly in the model provider selector
• Verify documentation pages load in both English and Chinese
• Test creating an AI Proxy channel with Avian's base URL and API key
• Confirm chat completions work with Avian models through the configured channel

cc @c121914yu @Archer-Li

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[avianion]

I have read the CLA Document and I hereby sign the CLA

[avianion]

recheck

[avianion]

I have read the CLA Document and I hereby sign the CLA

[avianion]

Hey @c121914yu, would love your review on this when you get a chance. Happy to address any feedback!