Apply review feedback from PR #40: fix missing RareLevel assignment and documentation

[Copilot]

Addresses review comments from the rare ID and level support implementation (PR #40).

Changes:

• Missing property assignment: Added RareLevel = model.RareLevel; in RecommendInfo.Update() to sync with API model
• Documentation fixes:
  • Fixed typo "北京" → "背景" in RareGuildResources.IdIcon
  • Added missing period in RareLevel.Intermediate enum documentation
  • Corrected terminology "自定义 ID" → "靓号 ID" in IRecommendInfo.RareId remarks
• Missing API field: Added VoiceChannelLink property to RareGuildResources and mapping from RareGuildSettings API model

public readonly struct RareGuildResources
{
    // ... existing properties ...
    
    /// <summary>
    ///     获取服务器靓号关联的语音频道链接。
    /// </summary>
    public string? VoiceChannelLink { get; init; }
}

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull request overview

Applies follow-up fixes from PR #40 to ensure recommended-server “靓号” data is correctly populated and documented, and extends the exposed resources model to include an additional API field.

Changes:

• Sync RecommendInfo.RareLevel from the API model during RecommendInfo.Update().
• Add VoiceChannelLink to RareGuildResources and map it from RareGuildSettings in EntityExtensions.
• Fix/standardize Chinese documentation text (typo, punctuation, and “靓号 ID” terminology).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/Kook.Net.Rest/Extensions/EntityExtensions.cs	Maps new VoiceChannelLink from API RareGuildSettings into RareGuildResources.
src/Kook.Net.Rest/Entities/Guilds/RecommendInfo.cs	Fixes missing RareLevel assignment in Update() to keep entity in sync with API model.
src/Kook.Net.Core/Entities/Guilds/RareLevel.cs	Documentation punctuation fix for Intermediate.
src/Kook.Net.Core/Entities/Guilds/RareGuildResources.cs	Documentation typo fix and adds new optional VoiceChannelLink property.
src/Kook.Net.Core/Entities/Guilds/IRecommendInfo.cs	Documentation terminology correction (“自定义 ID” → “靓号 ID”).

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