feat(workflow-builder): migrate builder integration to Max

[YYH211]

Summary

• migrate the Workflow Builder runtime and workflow CLI integration to Max while keeping the FastGPT UI and workflow-core contracts in this repository
• preserve submitted ChangeSet command order and attach command index/type context to execution diagnostics
• send the selected model ID to Max so explicit model selection is preserved
• propagate client disconnects through the Max API proxy and add SSE/abort regression coverage
• update the max submodule to 395d67e, which is proposed by labring/fastgpt-max#4

Dependency and merge order

1. merge https://github.com/labring/fastgpt-max/pull/4
2. confirm the max submodule commit is reachable from labring/fastgpt-max (update the pointer here if the Max PR is squash-merged)
3. merge this PR into test/pr-7681

Verification

• pnpm test packages/workflow-core/test/command/changeSet.test.ts packages/workflow-core/test/command/mergeChangeSet.test.ts (2 files, 16 tests passed)
• pnpm test projects/app/test/pages/api/maxApi/proxy.test.ts (1 file, 3 tests passed)
• commit-time ESLint and Prettier checks passed
• git diff --check

Notes

• this branch is based directly on test/pr-7681 and was 0 commits behind at submission; no rebase was needed
• local verification emitted an engine warning because the current environment uses Node.js 20.19.5 while the repository declares Node.js >=22.23.2.

[github-actions]

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🕒 Time: 2026-09-22 17:43:12 (UTC+8)

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	48.19%	4207 / 8730
🔵	Statements	47.96%	4449 / 9275
🔵	Functions	45.7%	815 / 1783
🔵	Branches	43.23%	2212 / 5116

File Coverage

No changed files found.

Generated in workflow #3665 for commit 4cdc9e2 by the Vitest Coverage Report Action