feat(model): add Doubao 2.0 model presets

[c121914yu]

What

Add Doubao-Seed-2.0 series model presets, released on 2025-02-14.

Models Added

Model ID	Description
doubao-seed-2-0-pro-260215	Flagship Agent model for deep reasoning & long-chain task execution
doubao-seed-2-0-lite-260215	Balanced performance and cost, surpasses Doubao 1.8
doubao-seed-2-0-mini-260215	Low latency, high concurrency, cost-sensitive scenarios
doubao-seed-2-0-code-preview-260215	Optimized for coding scenarios (works with TRAE)

Specs (all 2.0 models)

• Context window: 256k
• Max input: 256k
• Max output: 128k (default 4k)
• Vision (multimodal understanding): ✅
• Reasoning (deep thinking): ✅
• Tool calling: ✅

Reference

• Volcengine Model List
• Doubao 2.0 Announcement

[github-actions]

✅ Build Successful - Preview Images for this PR:

registry.cn-hangzhou.aliyuncs.com/fastgpt/fastgpt-plugin-pr:cb338bf5aa06a75a812bd2607c8828038863fa0a

Changed packages:
None

[Copilot]

Pull request overview

This PR adds support for the new Doubao Seed 2.0 series models from Volcengine, which were released with significantly enhanced capabilities compared to the 1.x series. The changes add four new model configurations (pro, lite, mini, and code-preview variants) to the Doubao provider list.

Changes:

• Added four Doubao Seed 2.0 model presets with 256k context window and 128k max output tokens
• All new models support vision, reasoning, and tool calling capabilities

Comments suppressed due to low confidence (1)

modules/model/provider/Doubao/index.ts:49

• The model names end with "260215" which represents February 15, 2026 (YYMMDD format), but the PR description states these models were released on February 14, 2025. Looking at the existing Doubao model naming pattern (e.g., "doubao-seed-1-8-251228" for December 28, 2025), the date suffix should be "250214" (February 14, 2025) not "260215". Please verify the correct release date and update the model names accordingly.

      model: 'doubao-seed-2-0-pro-260215',
      maxContext: 256000,
      maxTokens: 128000,
      quoteMaxToken: 256000,
      maxTemperature: 1,
      vision: true,
      reasoning: true,
      toolChoice: true
    },
    {
      type: ModelTypeEnum.llm,
      model: 'doubao-seed-2-0-lite-260215',
      maxContext: 256000,
      maxTokens: 128000,
      quoteMaxToken: 256000,
      maxTemperature: 1,
      vision: true,
      reasoning: true,
      toolChoice: true
    },
    {
      type: ModelTypeEnum.llm,
      model: 'doubao-seed-2-0-mini-260215',
      maxContext: 256000,
      maxTokens: 128000,
      quoteMaxToken: 256000,
      maxTemperature: 1,
      vision: true,
      reasoning: true,
      toolChoice: true
    },
    {
      type: ModelTypeEnum.llm,
      model: 'doubao-seed-1-8-251228',
      maxContext: 220000,
      maxTokens: 16000,
      quoteMaxToken: 220000,
      maxTemperature: 1,
      vision: true,
      reasoning: true,
      toolChoice: true
    },

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