Add Fireworks AI models to our converse Provider

[benie-joy-possi]

Description

Add the following Fireworks AI models to our supported model catalog and route them through the AI gateway:

• fireworks/glm-5
• fireworks/qwen3-reranker-8b
• fireworks/qwen3-embedding-8b
• fireworks/kimi-k2p5
• fireworks/playground-v2-5-1024px-aesthetic
• fireworks/fireworks-asr-v2
• fireworks/whisper-v3
• fireworks/whisper-v3-turbo
• fireworks/minimax-m2p5
• fireworks/stable-diffusion-xl-1024-v1-0

Reference: https://app.fireworks.ai/models

Acceptance Criteria

• Models are registered and discoverable via /v1/models
• Requests can be routed to Fireworks AI successfully
• No impact on existing providers