fix: 仓库材料识别不显示结果

[aaa1115910]

修复因 MaaAssistantArknights/MaaAssistantArknights#15358 仓库识别结构变更导致仓库材料识别不显示结果

fix #82

Summary by Sourcery

更新仓库（depot）模型和导出方式，以适配新的后端结构，并恢复材料识别输出。

Bug 修复：

• 修复后端结构变更后，仓库材料识别结果不再显示的问题。

增强内容：

• 将 MAADepot 数据结构简化为扁平的 JSON 字符串，并在需要时从中派生 arkplanner / lolicon 导出数据。

Original summary in English

Summary by Sourcery

Update depot model and exports to align with new backend structure and restore material recognition output.

Bug Fixes:

• Fix depot material recognition not displaying results after backend structure changes.

Enhancements:

• Simplify MAADepot data structure to a flat JSON string and derive arkplanner/lolicon exports on demand from it.

[sourcery-ai]

Hey - 我在这里给出了一些总体反馈：

• 从 data 解码 JSON 为 [String: Int] 的逻辑在 contents、arkPlannerExportText 和 loliconExportText 中都有重复；建议抽取成一个单独的辅助函数或计算属性，以避免重复并保持解码逻辑的一致性。
• arkPlannerExportText 和 loliconExportText 在任何解码/序列化错误时都会返回空字符串，而这个空字符串仍会被复制到剪贴板；建议改为返回可选的 String 或将错误向上抛出，这样 UI 就可以禁用按钮或显示失败状态，而不是静默复制一个空值。

给 AI Agent 的提示

Please address the comments from this code review:

## Overall Comments
- The JSON decoding from `data` into `[String: Int]` is duplicated in `contents`, `arkPlannerExportText`, and `loliconExportText`; consider extracting this into a single helper/computed property to avoid repetition and keep the decoding logic consistent.
- Both `arkPlannerExportText` and `loliconExportText` return an empty string on any decoding/serialization error, which will still be copied to the clipboard; consider returning an optional `String` or surfacing the error so the UI can disable the buttons or show a failure state instead of silently copying an empty value.

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Original comment in English

Hey - I've left some high level feedback:

• The JSON decoding from data into [String: Int] is duplicated in contents, arkPlannerExportText, and loliconExportText; consider extracting this into a single helper/computed property to avoid repetition and keep the decoding logic consistent.
• Both arkPlannerExportText and loliconExportText return an empty string on any decoding/serialization error, which will still be copied to the clipboard; consider returning an optional String or surfacing the error so the UI can disable the buttons or show a failure state instead of silently copying an empty value.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The JSON decoding from `data` into `[String: Int]` is duplicated in `contents`, `arkPlannerExportText`, and `loliconExportText`; consider extracting this into a single helper/computed property to avoid repetition and keep the decoding logic consistent.
- Both `arkPlannerExportText` and `loliconExportText` return an empty string on any decoding/serialization error, which will still be copied to the clipboard; consider returning an optional `String` or surfacing the error so the UI can disable the buttons or show a failure state instead of silently copying an empty value.

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