fix: make tidb service optional with proper profile in docker compose yaml

[bowenliang123]

Summary

• adding profile in docker compose for tidb container , making it optional without starting it by default

Screenshots

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Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[bowenliang123]

cc @laipz8200 @JohnJyong @crazywoola

[bowenliang123]

Let me check whether it works, without exposing the port 4000 to the host.