feat: 增加 WebUI 配置选项禁用匿名使用统计

[Blueteemo]

问题描述

Metric 模块当前只能通过环境变量 ASTRBOT_DISABLE_METRICS 控制，用户需要在 WebUI 中添加配置选项。

修复方案

1. 在 default.py 添加 disable_metrics 配置项
2. 在 metrics.py 添加 _is_disabled() 方法检查配置
3. 在 config-metadata.json 添加中英俄翻译

关联 Issue

Fixes #7941

Summary by Sourcery

Add a configurable option to disable anonymous metrics collection via the WebUI and centralize the metrics-disable check.

New Features:

• Introduce a disable_metrics configuration flag exposed in the WebUI to control anonymous usage statistics upload.

Enhancements:

• Refactor metrics disabling logic into a shared helper that respects both environment variables and configuration options.
• Update i18n config metadata to include labels and descriptions for the new disable_metrics setting in Chinese and English.

[sourcery-ai]

Hey - I've left some high level feedback:

• The Metric._disable_metrics class attribute is never written to anywhere, so it’s effectively dead code; consider removing it or adding a clear public setter/use-site if you intend it to be configurable at runtime.
• In _is_disabled(), you’re catching a broad Exception around the config import and access; narrowing this to the specific expected exceptions (e.g. ImportError / AttributeError / KeyError) would avoid hiding unrelated runtime errors.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- The `Metric._disable_metrics` class attribute is never written to anywhere, so it’s effectively dead code; consider removing it or adding a clear public setter/use-site if you intend it to be configurable at runtime.
- In `_is_disabled()`, you’re catching a broad `Exception` around the config import and access; narrowing this to the specific expected exceptions (e.g. `ImportError` / `AttributeError` / `KeyError`) would avoid hiding unrelated runtime errors.

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[gemini-code-assist]

Code Review

This pull request introduces a feature to disable anonymous usage statistics via a new configuration option and environment variable. The changes include updates to the default configuration, the metrics utility logic, and localization files for the dashboard. A review comment suggests optimizing the logic for checking the disabled status and using more specific exception handling to improve code robustness and readability.

[Blueteemo]

@sourcery-ai review

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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