Feat/add metrics notice to first notice

[lingyun14beta]

#7946 正在为 WebUI 添加禁用此功能的配置选项，本 PR 依赖 #7946 合并。

Modifications / 改动点

修改 FIRST_NOTICE.md：添加说明（中文）
修改 FIRST_NOTICE.en-US.md：添加说明（英文）
新增 FIRST_NOTICE.ru-RU.md：新增俄语版首次提示。

• This is NOT a breaking change. / 这不是一个破坏性变更。

Screenshots or Test Results / 运行截图或测试结果

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Checklist / 检查清单

• 😊 If there are new features added in the PR, I have discussed it with the authors through issues/emails, etc.
  / 如果 PR 中有新加入的功能，已经通过 Issue / 邮件等方式和作者讨论过。

• 👀 My changes have been well-tested, and "Verification Steps" and "Screenshots" have been provided above.
  / 我的更改经过了良好的测试，并已在上方提供了“验证步骤”和“运行截图”。

• 🤓 I have ensured that no new dependencies are introduced, OR if new dependencies are introduced, they have been added to the appropriate locations in requirements.txt and pyproject.toml.
  / 我确保没有引入新依赖库，或者引入了新依赖库的同时将其添加到 requirements.txt 和 pyproject.toml 文件相应位置。

• 😮 My changes do not introduce malicious code.
  / 我的更改没有引入恶意代码。

Summary by Sourcery

Document anonymous usage metrics collection and add a Russian version of the first-run notice.

Documentation:

• Update Chinese and English first-run notices to mention anonymous usage statistics collection and how to disable it.
• Add a Russian localized first-run notice including usage, licensing, and metrics information.

[sourcery-ai]

Hey - I've left some high level feedback:

• Please double-check that the terms used for the settings section ("Normal Config", "普通配置", "Обычная конфигурация") exactly match the current UI labels so users can easily find where to disable metrics collection.
• In the Russian notice, consider aligning formatting with the other locales (e.g., splitting the long paragraph about open source and no commercial services into separate lines/paragraphs) to keep structure consistent across languages.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Please double-check that the terms used for the settings section ("Normal Config", "普通配置", "Обычная конфигурация") exactly match the current UI labels so users can easily find where to disable metrics collection.
- In the Russian notice, consider aligning formatting with the other locales (e.g., splitting the long paragraph about open source and no commercial services into separate lines/paragraphs) to keep structure consistent across languages.

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[gemini-code-assist]

Code Review

This pull request adds a notice regarding usage statistics collection to the English and Chinese versions of the FIRST_NOTICE file and introduces a new Russian translation of the notice. The review feedback identifies that the term "anonymous" is technically inaccurate as the system collects hostnames, which may contain identifiable information; it is suggested to either remove hostname collection or update the description to "non-sensitive usage statistics" to maintain accuracy.

[lingyun14beta]

改改

[lingyun14beta]

#7955