chore: use google's new sdk

[hjlarry]

Summary

Tip

Close issue syntax: Fixes #<issue number> or Resolves #<issue number>, see documentation for more details.

sdk doc: https://googleapis.github.io/python-genai/ It support both gemini and vertex.
I already test basic chat, agent tools, multimodal files...
not work for json_schema now, wait the maintainer to resolve this. googleapis/python-genai#14

Screenshots

Before	After
...	...

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

[yihong0618]

ci works !#11752

[hjlarry]

ci works !#11752

cool! seems require another PR to fix the CI

[yihong0618]

ci works !#11752

cool! seems require another PR to fix the CI

Done can you take a look?

[hjlarry]

Done can you take a look?

Sure! It works now!