feat: add Parasail provider

[matanyall]

Add Parasail provider

This PR adds Parasail — an OpenAI-compatible serverless inference cloud for open-weight models — and its serverless model catalog (31 models).

Source of data

All pricing, context limits, and capability flags are pulled from Parasail's OpenRouter-compatible models API:

GET https://api.parasail.io/api/v1/openrouter/models

• Costs are per million tokens (USD), taken directly from the API's pricing.prompt / pricing.completion / pricing.input_cache_read.
• release_date / last_updated are derived from each model's created timestamp in the API.
• reasoning, tool_call, structured_output come from the API's supported_features.
• attachment + image input modality set for the vision-language (-vl-) models.
• open_weights = true for all (Parasail serves open-weight models).

Notes

• Embedding-only models (e.g. bge-m3) are omitted since the schema requires cost.output.
• bun validate passes locally.

Provider

name = "Parasail"
npm = "@ai-sdk/openai-compatible"
api = "https://api.parasail.io/v1"
doc = "https://docs.parasail.io/parasail-docs/"
env = ["PARASAIL_API_KEY"]