feat(provider): add StepFun Token Plan

[zhangmo8]

Summary

• keep the existing stepfun pay-as-you-go profile on https://api.stepfun.com/v1
• add a disabled stepfun-step-plan profile on https://api.stepfun.com/step_plan/v1
• use the dedicated Step Plan provider-db catalog and step-3.7-flash connection check
• document compatibility and cover defaults, registry, model discovery, and refresh classification

UI

Before

Providers
  StepFun                 https://api.stepfun.com/v1

After

Providers
  StepFun                 https://api.stepfun.com/v1
  StepFun Token Plan      https://api.stepfun.com/step_plan/v1

Validation

• pnpm exec vitest --config vitest.config.ts --run test/main/provider/defaultProviders.test.ts test/main/provider/basicApiKeyProviders.test.ts test/main/shared/providerDbCatalog.test.ts
• pnpm run format
• pnpm run format:check
• pnpm run i18n
• pnpm run lint
• pnpm run typecheck

Summary by CodeRabbit

• New Features

  • Added a disabled StepFun Token Plan provider option with its own endpoint and API-key configuration.
  • Added support for discovering Token Plan models, including capabilities and token limits.
  • Added connection validation using the recommended step-3.7-flash model.
  • Preserved existing StepFun settings and kept both provider profiles independent.

• Documentation

  • Added implementation guidance, specifications, integration details, compatibility expectations, and validation checklists.

• Tests

  • Added coverage for provider discovery, configuration, model catalog mapping, endpoint validation, and disabled default settings.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 56068a13-2b2f-4bb1-ad14-3c6bd9bde7cf

📥 Commits

Reviewing files that changed from the base of the PR and between 9003ae5 and c2eb013.

📒 Files selected for processing (9)

• docs/features/stepfun-token-plan-provider/plan.md
• docs/features/stepfun-token-plan-provider/spec.md
• docs/features/stepfun-token-plan-provider/tasks.md
• src/main/provider/defaults.ts
• src/main/provider/providerRegistry.ts
• src/shared/providerDbCatalog.ts
• test/main/provider/basicApiKeyProviders.test.ts
• test/main/provider/defaultProviders.test.ts
• test/main/shared/providerDbCatalog.test.ts

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📝 Walkthrough

Walkthrough

Adds a disabled stepfun-step-plan provider profile with its Step Plan endpoint, provider-db model source, connection-check model, catalog classification, documentation, and focused test coverage while preserving the existing stepfun profile.

Changes

StepFun Token Plan Provider

Layer / File(s)	Summary
Provider contract and implementation plan docs/features/stepfun-token-plan-provider/*	Documents separate standard and Step Plan profiles, independent credentials and catalogs, endpoint and authentication requirements, compatibility constraints, and validation tasks.
Provider registration and catalog wiring src/main/provider/defaults.ts, src/main/provider/providerRegistry.ts, src/shared/providerDbCatalog.ts	Registers the disabled stepfun-step-plan profile with the Step Plan URL, OpenAI-compatible settings, provider-db source, step-3.7-flash check model, and provider-db classification.
Provider behavior and metadata tests test/main/provider/*, test/main/shared/providerDbCatalog.test.ts	Tests default metadata, provider registration, whitespace-normalized provider-db recognition, Token Plan model mapping, token conversions, and connection-check configuration.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Possibly related PRs

• ThinkInAIXYZ/deepchat#1432: Covers provider-db refresh behavior for newly classified database-backed providers.
• ThinkInAIXYZ/deepchat#1556: Adds a comparable Token Plan provider through default-provider and registry wiring.
• ThinkInAIXYZ/deepchat#1948: Extends the same provider registration and disabled built-in provider test patterns.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding the StepFun Token Plan provider.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/stepfun-token-plan-provider

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