feat: add Astraflow provider support

[ucloudnb666]

Summary

Adds support for Astraflow (by UCloud / 优刻得), an OpenAI-compatible AI model aggregation platform supporting 200+ models.

Because Astraflow exposes an OpenAI-compatible API, integration requires only registering it as a DefaultModelSuppliers entry — the existing else branch in LLMEndpoint.from_config already routes unknown suppliers through ChatOpenAI with the configured base_url and api_key, so no new SDK dependency is required.

Endpoints

Endpoint	Base URL	Env var
Global (US/CA)	https://api-us-ca.umodelverse.ai/v1	ASTRAFLOW_API_KEY
China	https://api.modelverse.cn/v1	ASTRAFLOW_CN_API_KEY

The env var names are auto-derived by the existing normalize_to_env_variable_name helper ("astraflow" → ASTRAFLOW_API_KEY, "astraflow_cn" → ASTRAFLOW_CN_API_KEY).

Changes

core/quivr_core/rag/entities/config.py (single file, two locations)

1. Add ASTRAFLOW and ASTRAFLOW_CN to the DefaultModelSuppliers enum.
2. Add representative model configs in LLMModelConfig._model_defaults for both suppliers so context-window / tokenizer resolution works out of the box.

Usage

import os
from quivr_core.rag.entities.config import LLMEndpointConfig, DefaultModelSuppliers

os.environ["ASTRAFLOW_API_KEY"] = "<your-key>"

# Global (US/CA) endpoint
config = LLMEndpointConfig(
    supplier=DefaultModelSuppliers.ASTRAFLOW,
    model="gpt-4o",
    llm_base_url="https://api-us-ca.umodelverse.ai/v1",
)

# China endpoint
os.environ["ASTRAFLOW_CN_API_KEY"] = "<your-cn-key>"
config_cn = LLMEndpointConfig(
    supplier=DefaultModelSuppliers.ASTRAFLOW_CN,
    model="gpt-4o",
    llm_base_url="https://api.modelverse.cn/v1",
)

Notes

• Zero new dependencies — reuses the existing langchain_openai.ChatOpenAI client via the else branch.
• Minimal surface area: one file changed.

---

Summary by cubic

Add Astraflow provider support (global and China) using the existing OpenAI-compatible path via langchain_openai.ChatOpenAI. No new dependencies.

• New Features
  • Added ASTRAFLOW and ASTRAFLOW_CN to DefaultModelSuppliers.
  • Added defaults in LLMModelConfig._model_defaults for gpt-4o, gpt-4o-mini, and claude-3-5-sonnet.
  • Supports https://api-us-ca.umodelverse.ai/v1 and https://api.modelverse.cn/v1; env vars are ASTRAFLOW_API_KEY and ASTRAFLOW_CN_API_KEY.

^{Written for commit 399ae8a. Summary will update on new commits.}

[cubic-dev-ai]

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