feat: add Vivgrid provider support

[zihan987]

📝 Description
Adds Vivgrid as a new LLM provider using the OpenAI-compatible endpoint (https://api.vivgrid.com/v1). Vivgrid is an AI Agent and LLM infrastructure platform that helps developers build, deploy, and operate AI-powered applications with speed, reliability, and cost efficiency.

vivgrid-openclaw

Vivgrid exposes an OpenAI-compatible API, so this implementation reuses the existing openai_compat provider
infrastructure.

Files changed:

• pkg/config/config.go — Vivgrid provider config struct
• pkg/config/defaults.go — Default model settings for Vivgrid (vivgrid/auto)
• pkg/config/migration.go — Config migration support
• pkg/config/migration_test.go — Migration coverage updated
• pkg/providers/factory.go — Provider selection & fallback inference
• pkg/providers/factory_provider.go — Factory registration & default API base
• pkg/providers/factory_test.go — Provider selection test
• pkg/providers/factory_provider_test.go — Default API base coverage
• pkg/providers/openai_compat/provider.go — Strips vivgrid/ prefix for OpenAI-compatible calls
• pkg/providers/openai_compat/provider_test.go — Prefix stripping tests

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🗣️ Type of Change

• ✨ New feature (non-breaking change which adds functionality)

———

☑️ Checklist

• My code/docs follow the style of this project.
• I have performed a self-review of my own changes.
• I have updated the documentation accordingly.

———

[CLAassistant]

All committers have signed the CLA.

[yinwm]

Review Summary

Thanks for adding Vivgrid provider support! The implementation follows the existing patterns well and has good test coverage. However, there are a few issues that need to be addressed before merging.

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🔴 Must Fix

1. Copy-paste error in README.md (line 942)

| `vivgrid`                  | LLM (Cerebras direct)                   | [vivgrid.com](https://vivgrid.com)                                   |

The description says "Cerebras direct" but it should be "Vivgrid" or "OpenAI-compatible". This is clearly a copy-paste mistake.

2. Table formatting broken in README.md (lines 975-977)

| **神算云**          | `shengsuanyun/`   | `https://router.shengsuanyun.com/api/v1`            | OpenAI    |                       |
| **Vivgrid**         | `vivgrid/`       | `https://api.vivgrid.com/v1`                        | OpenAI    | [Get Key](https://vivgrid.com)                                                             |

• The 神算云 row is missing the - link column (looks like it was accidentally removed)
• The Vivgrid row has trailing whitespace after the link

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🟡 Suggestions

1. Model inference logic could be more precise (factory.go line 306)

case (strings.Contains(lowerModel, "vivgrid") || strings.HasPrefix(model, "vivgrid/")) && cfg.Providers.Vivgrid.APIKey != "":

Using strings.Contains(lowerModel, "vivgrid") might be too loose. A model named my-vivgrid-model would incorrectly match. Consider using only the prefix check:

case strings.HasPrefix(model, "vivgrid/") && cfg.Providers.Vivgrid.APIKey != "":

2. Extra blank line in docs/migration/model-list-migration.md (line 105)

There's an extra blank line added. Consider removing it for cleaner documentation.

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✅ What's Done Well

• Code structure follows existing provider patterns (consistent with Cerebras, DeepSeek, etc.)
• Good test coverage for migration, factory, and normalize model functions
• All necessary files updated (config, factory, provider, tests, docs)

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Please fix the README issues and I'll be happy to approve this PR!

[yinwm]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

🤖 Generated with Claude Code

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[yinwm]

LGTM

[Orgmar]

@zihan987 Adding Vivgrid as a provider and reusing the openai_compat infrastructure is the right call. Keeps things clean and consistent with how other compatible endpoints are integrated.

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