Refactor render API to auto-detect chart type from config

[Copilot]

The render() method required redundant type specification—passed both as first parameter and within syntax/config. This refactors to single-parameter API where type is auto-detected.

API Changes

Old:

g.render('pie', { data: [...] })
g.render('pie', 'vis pie\ndata\n...')

New:

g.render({ type: 'pie', data: [...] })
g.render('vis pie\ndata\n...')  // type extracted from syntax

Type detection logic:

• Config objects: reads type field directly
• Syntax strings: parses vis [type] declaration via existing parser
• Throws clear error if type missing

Streaming simplified

Eliminates regex pattern matching:

// Before
const type = buffer.match(/vis\s+(\S+)/)?.[1];
if (type) gptVis.render(type, buffer);

// After
gptVis.render(buffer);  // type auto-detected

Other changes

• Relocated parser: src/ai/parser.ts → src/syntax/parser.ts (better semantic organization)
• Removed deprecated skills: .github/skills/gpt-vis-ai-*
• Updated examples: All README, playground, and framework integration code updated

Breaking change

⚠️ Affects GPTVis class API only. Individual component APIs (Pie(), Bar(), etc.) unchanged.

Original prompt

帮我重构一下 render 这个 api。去掉第一个参数，直接传入 syntax string 或者 config object，在 render 函数中去判断 chart type。

注意：

1. 所有组件的 render 函数都要改，都不需要第一个参数。
2. 同步修改单元测试，各种组件 readme 文档，以及 playground 的代码
3. 修改 readme，简化其中使用案例代码，无需再正则解析出 type 了。
4. 保持代码代码简洁，最终根目录运行一下 npm run formar，解决 lint 问题

另外附带解决两个问题：

1.src/ai 下的 parser 代码，挪到 src/syntax 下面。
2. 删除 github 两个 skills，已经不需要了。

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Latest commit: 36385b7

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