feat: add openGauss DataVec as vector database backend

[mryanzhicong]

Add openGauss with DataVec extension as a new vector storage option alongside PGVector and Milvus. Includes vector DB controller, Docker Compose deployment configs (CN/Global), deploy generation scripts, and test templates.

[cla-assistant]

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[cla-assistant]

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[c121914yu]

Please add the integration test : FastGPT/test/integrationTest/vectorDB

[mryanzhicong]

Completed tests:

• Verified vector data write and query functionality by creating new knowledge bases and uploading data via both single-file and batch upload methods.

• Verified vector data retrieval in workflows using both single-knowledge-base and multi-knowledge-base search scenarios.

[mryanzhicong]

Changes

• Added integration test entry for openGauss vector DB:
  index.integration.test.ts

• Updated test env template guidance (to make openGauss-only local runs easier):
  .env.test.tempalte

Test Results

• openGauss: 6 passed

[github-actions]

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[mryanzhicong]

https://github.com/labring/FastGPT/actions/runs/23711536707

The failure was caused by that run using an outdated workflow configuration: it resolved the image target as code-sandbox and attempted to build projects/code-sandbox/Dockerfile, but this repository only has projects/sandbox, so Docker buildx failed with lstat projects/code-sandbox: no such file or directory.

I’ve pushed an empty commit to retrigger the PR workflow. The previous error has been bypassed, but some stale check information is still showing.
Could you please approve and start the new Action run, and use the latest run result as the source of truth? Thanks.

[mryanzhicong]

@c121914yu 您好，可以批准触发一次新的 CI 吗，之前那次好像用了旧的 workflow