feat(genai): Add samples for Bounding Box, Embeddings, Provisioned Throughput, Safety

[Guiners]

Description

Fixes #

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[snippet-bot]

Here is the summary of changes.

You are about to add 5 region tags.

• genai/bounding-box/boundingbox-with-txt-img.js:17, tag googlegenaisdk_boundingbox_with_txt_img
• genai/embeddings/embeddings-docretrieval-with-txt.js:17, tag googlegenaisdk_embeddings_docretrieval_with_txt
• genai/express-mode/api-key-example.js:17, tag googlegenaisdk_vertexai_express_mode
• genai/provisioned-throughput/provisionedthroughput-with-txt.js:17, tag googlegenaisdk_provisionedthroughput_with_txt
• genai/safety/safety-with-txt.js:17, tag googlegenaisdk_safety_with_txt

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[gemini-code-assist]

Summary of Changes

Hello @Guiners, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the GenAI sample collection by adding new examples that showcase advanced capabilities of the Google GenAI SDK. These additions cover key areas such as visual content analysis with bounding boxes, efficient information retrieval using embeddings, flexible authentication with API keys, optimized model deployment via provisioned throughput, and robust content moderation through configurable safety settings. The changes also include necessary updates to project dependencies to align with the latest SDK versions and best practices.

Highlights

• New GenAI Samples: Introduces five new samples demonstrating various Google GenAI SDK features, including bounding box detection, document retrieval embeddings, API key authentication, provisioned throughput, and content safety settings.
• Dependency Updates: The @google/genai dependency has been updated, and several other dependencies have been adjusted in genai/package.json to support the new samples and streamline the project.
• Comprehensive Testing: Each new sample is accompanied by a dedicated test file, ensuring the functionality and correctness of the added features.

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[gemini-code-assist]

Code Review

This pull request adds several new samples for the GenAI SDK. My review focuses on correctness, security best practices, and ensuring the samples are runnable and accurately demonstrate the intended features. I've found a critical issue in package.json where runtime dependencies are listed as dev dependencies, which will break the samples for users. I've also identified several high-severity issues, including a security concern with a hardcoded API key placeholder, misleading sample code, and incorrect error handling and testing for safety-blocked responses. Additionally, there are some medium-severity suggestions to improve code quality.

[cfloress]

LGTM