refactor: antv skill refactor

[lxfu1]

Content markdown 作为唯一知识源 → Build 脚本生成索引 → zvec 提供混合检索 → CLI/API/HTTP 多层暴露

1. 简化 skills ，内容移入 src/content
2. 移除 bm25 召回逻辑
3. 基于 @zvec/zvec 和 @huggingface/transformers 重构整个检索体现

[gemini-code-assist]

Code Review

This pull request refactors the retrieval and evaluation system, transitioning from file-path-based BM25 and tool-call strategies to an asynchronous, vector-based hybrid search using an in-process vector database (zvec) and the @huggingface/transformers library. Key changes include updating the embedding dimension to 512, adding a model pre-download script, refactoring the evaluation manager and CLI to support zvec retrieval, and rewriting the SKILL.md files for G2, G6, and X6 to provide streamlined quick references and critical rules. Additionally, comprehensive test suites were added for the embedder, synonyms, and token budget modules. The reviewer identified a critical inconsistency in the SKILL.md files where the library constraints endpoint was incorrectly documented as POST /info instead of POST /api/v1/info, which would cause LLM agent calls to fail.

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