fix: validate chat data ids before run

[xqvvu]

Summary

• add a shared chat dataId validation helper for the current human/AI round
• reject human and assistant using the same dataId before workflow execution
• reject current-round dataIds that already exist in chat_items before workflow execution
• wire the check into v1 chat completions, v2 chat completions, and chatTest
• keep the final unique-index/data migration work for the follow-up PR

Tests

• pnpm --filter @fastgpt/service test test/core/chat/dataIdValidation.test.ts
• pnpm --filter @fastgpt/app typecheck
• pnpm exec eslint --fix "projects/app/src/pages/api/core/chat/chatTest.ts" "projects/app/src/pages/api/v1/chat/completions.ts" "projects/app/src/pages/api/v2/chat/completions.ts" "packages/service/core/chat/dataIdValidation.ts" "packages/service/test/core/chat/dataIdValidation.test.ts"

[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	14.03%	1140 / 8124
🔵	Statements	14.02%	1195 / 8523
🔵	Functions	12.52%	245 / 1956
🔵	Branches	11.98%	536 / 4472

File Coverage

No changed files found.

Generated in workflow #256 for commit fb54317 by the Vitest Coverage Report Action

[github-actions]

Coverage Report for global

Status	Category	Percentage	Covered / Total
🔵	Lines	89.92%	2295 / 2552
🔵	Statements	89.02%	2506 / 2815
🔵	Functions	93.13%	434 / 466
🔵	Branches	84.54%	1679 / 1986

File Coverage

No changed files found.

Generated in workflow #928 for commit fb54317 by the Vitest Coverage Report Action

[github-actions]

Coverage Report for service

Status	Category	Percentage	Covered / Total
🔵	Lines	35.71%	4686 / 13119
🔵	Statements	35.42%	4957 / 13994
🔵	Functions	31.84%	876 / 2751
🔵	Branches	31.32%	2647 / 8451

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/service/core/chat/dataIdValidation.ts	96.42%	90%	100%	100%	47

Generated in workflow #928 for commit fb54317 by the Vitest Coverage Report Action

[github-actions]

Coverage Report for app

Status	Category	Percentage	Covered / Total
🔵	Lines	6.41%	1852 / 28890
🔵	Statements	6.22%	1986 / 31894
🔵	Functions	3.86%	384 / 9943
🔵	Branches	4.91%	1021 / 20788

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
projects/app/src/pages/api/core/chat/chatTest.ts	0%	0%	0%	0%	70-368
projects/app/src/pages/api/v1/chat/completions.ts	0%	0%	0%	0%	69-697
projects/app/src/pages/api/v2/chat/completions.ts	0%	0%	0%	0%	78-766

Generated in workflow #928 for commit fb54317 by the Vitest Coverage Report Action

[github-actions]

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