fix(adapters): handle image fetch failures gracefully

[dingyi222666]

Summary

This PR improves error handling across all adapters when image fetching fails, ensuring that broken or inaccessible image URLs don't break message processing.

Bug fixes

• Image fetch failures no longer break message processing: Returns null from image processing functions when fetch errors occur
• Graceful degradation: Failed image content entries are filtered out, allowing chats to continue with text content
• Consistent error handling: Added try-catch blocks around image URL fetching in Claude, Gemini, Ollama, Qwen, and Zhipu adapters
• Hunyuan async handling: Converted langchainMessageToHunyuanMessage to async to properly handle image processing

Other Changes

• Filter null values from processed content arrays across all adapters
• Improved logging to use rawUrl variable instead of potentially undefined url
• Better type safety with explicit null filtering in image content arrays

[coderabbitai]

Walkthrough

跨多个适配器包的图像URL处理改进。包括更好的错误处理（记录构建的rawUrl而非未定义变量）、过滤空值结果、改用Promise.all进行并行处理，以及在Hunyuan适配器中引入异步图像获取。

Changes

内聚体 / 文件	变更摘要
Claude适配器 packages/adapter-claude/src/utils.ts	图像获取失败时记录rawUrl并返回null；processMessageContent现在过滤掉null条目
Gemini适配器 packages/adapter-gemini/src/utils.ts	构建rawUrl处理字符串或对象形式；显式过滤掉null条目后返回
Hunyuan适配器 packages/adapter-hunyuan/src/requester.ts, packages/adapter-hunyuan/src/utils.ts	langchainMessageToHunyuanMessage改为异步，新增plugin参数；通过plugin异步获取图像URL，使用Promise.all并过滤失败
Ollama适配器 packages/adapter-ollama/src/utils.ts	过滤images字段中的null/undefined；失败时计算rawUrl并返回null
Qwen适配器 packages/adapter-qwen/src/utils.ts	添加MessageContentImageUrl导入；使用Promise.all并行处理图像URL；过滤失败结果
Zhipu适配器 packages/adapter-zhipu/src/utils.ts	添加MessageContentImageUrl导入；图像URL通过fetchImageUrl展开；使用Promise.all并过滤失败
共享适配器 packages/shared-adapter/src/utils.ts	用并行fetchImageUrl替代迭代处理；失败时返回null并过滤；使用Promise.all和spread语法

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Poem

🐰 Whiskers twitch with glee!
Images now fetch with grace,
Null entries flee and hide,
Promise.all races them with pride,
My gardens grow more fair! 🌿

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main objective: graceful handling of image fetch failures across adapters, which is the primary focus of this changeset.
Description check	✅ Passed	The description is directly related to the changeset, detailing the bug fixes, improvements to error handling, and modifications across multiple adapter files.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/adapter-image-read

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[gemini-code-assist]

Summary of Changes

Hello @dingyi222666, 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 enhances the resilience of the system's various adapters by introducing robust error handling mechanisms for image fetching operations. By ensuring that image fetch failures do not halt message processing and instead allow for graceful degradation, the changes improve the overall stability and user experience. The update also standardizes error handling practices and refines asynchronous operations where image processing is involved.

Highlights

• Robust Image Fetching Error Handling: Implemented try-catch blocks across multiple adapters (Claude, Gemini, Ollama, Qwen, Zhipu, Shared) to gracefully handle failures when fetching image URLs.
• Graceful Degradation: Image processing functions now return 'null' upon fetch errors, and subsequent content arrays are filtered to remove these 'null' entries, ensuring message processing continues with available text content.
• Asynchronous Image Processing for Hunyuan: The 'langchainMessageToHunyuanMessage' function was converted to an asynchronous operation to properly integrate 'fetchImageUrl' and handle potential image processing delays or failures.
• Improved Logging and Type Safety: Enhanced error logging to use 'rawUrl' for better context and introduced explicit null filtering for image content arrays to improve type safety.

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[gemini-code-assist]

Code Review

This pull request improves error handling for image fetching across various adapters, preventing crashes when an image URL is inaccessible. However, by systematically moving image fetching from LLM providers to the server side, it introduces Server-Side Request Forgery (SSRF) vulnerabilities in the OpenAI, Hunyuan, Qwen, and Zhipu adapters, as user-provided URLs are fetched without validation. It is highly recommended to implement URL validation (e.g., restricting to public IPs and allowed protocols) before performing network requests on the server. Furthermore, error logging was missed in some new try-catch blocks, which should be added to improve diagnostics and ensure all image fetch failures are visible.