[arcee] Add hosted model pricing

[pranav4501]

Description

Adds pricing/arcee.json with input, cached-input-read, and output pricing for seven models served through Arcee:

• deepseek/deepseek-v4-flash-latest
• deepseek/deepseek-v4-pro
• deepseek/deepseek-v4-pro-0813
• moonshotai/kimi-k3
• thinkingmachines/inkling-small
• trinity-large-thinking
• zai-org/glm-5.2

Prices are converted from the published USD-per-million-token rates into Portkey's cents-per-token representation.

• New model pricing
• Update existing pricing
• New model configuration
• Bug fix

Source Verification

Official pricing: https://docs.arcee.ai/get-started/pricing

Official models endpoint: https://api.arcee.ai/api/v1/models

The public pricing page lists six models. Pricing for deepseek/deepseek-v4-pro-0813 was verified through Arcee's authenticated /models endpoint.

Cache-write pricing is omitted because Arcee does not currently publish it.

Validation

• jq empty pricing/arcee.json
• npm run lint
• Prettier formatting check
• Duplicate-key check
• git diff --check

Checklist

• I have validated the JSON using jq
• I have verified that prices are in cents per token, not dollars
• I have included the official source links above
• I have signed the CLA, if required as a first-time contributor

Related Issue

Not applicable — this is a new provider pricing contribution.