Fix/expand chatui code highlighting 扩展 chatui 代码高亮

[atqiyu]

Motivation / 更改动机

修改通过vibecoding完成

AstrBot ChatUI 使用精简版 Shiki 代码高亮包，以降低前端资源体积和内存占用。但该精简包缺少 C、C++、Rust、Go 等常用编程语言的语法包，导致对应 Markdown 代码块无法正常进行语法高亮，只显示为单一颜色。

本 PR 扩展精简版 Shiki bundle，使更多常用开发语言能够正常高亮，同时保留未知语言回退为纯文本的行为。

Modifications / 改动点

• 在 ChatUI 的 Shiki 精简包中加入以下语言：

  • C
  • C++
  • C#
  • Rust
  • Go
  • Dart
  • Kotlin
  • Lua
  • PHP
  • R
  • Ruby
  • Scala
  • Swift

• 增加常见语言别名支持，例如：

  • c++、cc、cxx、hpp
  • golang
  • rs
  • cs
  • kt、kts

• 支持带附加参数的语言标签，例如 rust:variant。

• 同步更新 T2I Shiki runtime 的语言列表，确保不同渲染路径的行为保持一致。

• 新增 Shiki 语言归一化和代码高亮自动化测试。

• 未引入新的第三方依赖。

• 未改变未知语言回退为纯文本的行为。

• 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

• 更改前
• 更改后

已完成以下验证：

node --test tests/*.test.mjs
41 tests passed, 0 failed

pnpm exec vue-tsc --noEmit
passed

pnpm run build:t2i-shiki-runtime
passed

pnpm run build
passed

新增测试覆盖以下场景：

• C、C++、C#、Rust、Go、Dart、Kotlin、Lua、PHP、R、Ruby、Scala、Swift 均可被 Shiki 正确识别。
• 常见语言别名能够正确归一化。
• 代码高亮输出包含 Shiki token 样式。
• 未知语言仍会安全回退为纯文本。

———

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 results have been provided above.
  / 我的更改经过了充分测试，并已在上方提供验证结果。

• I have ensured that no new dependencies are introduced.
  / 我确保没有引入新的依赖库。

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

Summary by Sourcery

Expand Shiki language support and normalization so common programming-language code blocks render with syntax highlighting across ChatUI rendering paths.

New Features:

• Expand ChatUI and T2I Shiki highlighting to support C, C++, C#, Rust, Go, Dart, Kotlin, Lua, PHP, R, Ruby, Scala, and Swift.
• Recognize common language aliases and parameterized language labels during code-block highlighting.

Bug Fixes:

• Restore syntax highlighting for code blocks written in the newly supported languages while preserving plain-text fallback for unknown languages.

Enhancements:

• Keep the browser and T2I Shiki language configurations aligned through shared language support and normalization behavior.

Tests:

• Add automated coverage for language normalization, aliases, supported-language detection, syntax token output, and unknown-language fallback.

[sourcery-ai]

Hey - I've found 1 issue

Prompt for AI Agents

Please address the comments from this code review:

## Individual Comments

### Comment 1
<location path="dashboard/scripts/build-t2i-shiki-runtime.mjs" line_range="32" />
<code_context>
   cts: "typescript",
+  cs: "csharp",
   dockerfile: "bash",
+  golang: "go",
+  h: "c",
+  "h++": "cpp",
</code_context>
<issue_to_address>
**issue (broader_impact):** The T2I runtime aliases `golang` to `go`, but `go` is absent from `languageSpecs`, so the generated highlighter contains no Go grammar and its supported-language set excludes `go`. Go and `golang` code blocks therefore fall back to plain text or trigger the rendering fallback instead of being highlighted in the T2I path.

**Triggers:** When a T2I code block uses `go` or `golang`.

**Suggested fix:** Add `["go", "go"]` to `languageSpecs` before generating `shiki_runtime.iife.js`.

```suggestion
  ["go", "go"],
  ["javascript", "javascript"],
```
</issue_to_address>

Sourcery assessment

Approval pending. 1 finding to address first.

Blocking findings: dashboard/scripts/build-t2i-shiki-runtime.mjs:32

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[sourcery-ai]

Sourcery assessment

Approved.