Update google.golang.org/genai to v1.0.0

[devin-ai-integration]

Update google.golang.org/genai to v1.0.0

This PR updates the Google GenAI library from v0.7.0 to v1.0.0 and addresses the breaking API changes.

Changes

• Updated the dependency in go.mod from v0.7.0 to v1.0.0
• Updated role parameter types from string literals to Role enum in MessagesToGoogle function
• Updated client initialization in demo/server.go to use the new API
• Updated ThinkingConfig field from IncludeThoughts to Enabled
• Updated GenerateContentStream call to use the new API structure

Testing

The code changes have been made according to the v1.0.0 API changes. Due to Go version compatibility issues in the local environment, the build was not successful locally. The PR relies on CI to build and test with a compatible Go version.

Notes

The local environment has Go 1.18 which is not compatible with some of the dependencies required by the newer genai library. A Dockerfile has been added for testing with a newer Go version, but even that encountered compatibility issues with cloud.google.com/go@v0.120.0 requiring Go 1.23.0.

Link to Devin run: https://app.devin.ai/sessions/f5b7d7cee61545d0bf48e62e746618a7
Requested by: tk@coder.com

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