feat: Add Apertis provider support

[theQuert]

Summary

Add Apertis as a new LLM provider. Apertis is a model aggregation service with 470+ models, using OpenAI-compatible API.

Provider Details

• API Base URL: https://api.apertis.ai/v1
• Environment Variable: APERTIS_API_KEY
• NPM Package: @ai-sdk/openai-compatible
• Documentation: https://apertis.ai/docs

Initial Models

Model ID	Name	Tool Call	Reasoning
claude-opus-4-5-20251101	Opus 4.5	Yes	No
claude-opus-4-5-20251101-thinking	Opus 4.5 (Thinking)	Yes	Yes
claude-sonnet-4.5	Sonnet 4.5	Yes	No
claude-sonnet-4.5-20250929-thinking	Sonnet 4.5 (Thinking)	Yes	Yes
gpt-5.2-pro	GPT-5.2 Pro	Yes	No
gpt-5.2	GPT-5.2	Yes	No
gpt-5.2-codex	GPT-5.2 Codex	Yes	No
gemini-3-pro-preview	Gemini 3 Pro	Yes	No
grok-code-fast-1	Grok Code Fast 1	Yes	No
glm-4.7	GLM-4.7	Yes	No
glm-4.7-thinking	GLM-4.7 (Thinking)	Yes	Yes
minimax-m2.1	MiniMax M2.1	Yes	No

Implementation

Will create:

• providers/apertis/provider.toml
• Individual model TOML files for each model listed above