feat(providers): add Kimchi provider with kimi-k2.6, kimi-k2.5, minimax-m2.7

[Momin-786]

Summary

Adds Kimchi (https://kimchi.dev) as a new provider. Models are deployed
via CAST AI and served through an OpenAI-compatible endpoint.

Models Added

• kimi-k2.6 — via base_model moonshotai/kimi-k2.6
• kimi-k2.5 — via base_model moonshotai/kimi-k2.5
• minimax-m2.7 — via base_model minimax/MiniMax-M2.7

Pricing (per 1M tokens)

Model	Input	Output
kimi-k2.6	$1.20	$4.50
kimi-k2.5	$0.60	$3.00
minimax-m2.7	$0.30	$1.20

Source

• Pricing: https://docs.kimchi.dev/docs/model-apis-pricing
• Config reference: opencode kimchi provider config

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a new “Kimchi” provider integration by introducing provider metadata, model configuration files, and a logo asset.

Changes:

• Added providers/kimchi/provider.toml describing the Kimchi provider (env var, docs, API base).
• Added three Kimchi model definition TOMLs with cost/limits/modalities.
• Added a Kimchi logo SVG asset.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
providers/kimchi/provider.toml	Registers the Kimchi provider (package, env, docs, API endpoint).
providers/kimchi/models/minimax-m2.7.toml	Adds MiniMax-M2.7 model metadata (cost/limits/modalities).
providers/kimchi/models/kimi-k2.6.toml	Adds kimi-k2.6 model metadata (cost/limits/modalities).
providers/kimchi/models/kimi-k2.5.toml	Adds kimi-k2.5 model metadata (cost/limits/modalities).
providers/kimchi/logo.svg	Adds provider logo asset for UI/branding.

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