refactor(schema): getTableSchema 返回类型化行，移除 mermaid ER 图 - #14
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候选 5：getTableSchema 此前把 MySQL information_schema 裸行原样
导出，COLUMN_NAME / COLUMN_TYPE 的知识散布在 4+ 命令层站点，cast
遍地。在 driver 边界一次收窄为 SchemaColumn[]/SchemaIndex[]。
- types.ts 新增 SchemaColumn（nullable 布尔化）/ SchemaIndex（按
INDEX_NAME 聚合）/ TableSchema；裸行不再出边界
- formatSchemaMarkdown 改收类型化参数，cast 与 idxMap 分组逻辑消失
- 移除 mermaid ER 图（pi 不渲染图，用户只能看到源码文本）：
- 删 /db relations er-diagram 命令及 completions
- discover 的 AI 消息改为分表小节结构化文本（### 表 + 列列表），
更直接、更省 token、无 mermaid 语法噪音
- commands/relations.ts / schema.ts / db-tools.ts 消费点 cast 全部封口
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候选 5：getTableSchema 返回类型化行，挡住 information_schema 泄漏
变更内容
types.ts新增SchemaColumn（name/type/nullable 布尔/key/default/extra/comment）、SchemaIndex（按 INDEX_NAME 聚合：name/columns/unique）、TableSchemaconnection/db-manager.ts：getTableSchema在 driver 边界一次映射（IS_NULLABLE === "YES"→ nullable、索引分组聚合），裸行不再出边界formatting/schema-table.ts：formatSchemaMarkdown改收类型化参数，6+3 处 cast 与 idxMap 分组逻辑消失/db relations er-diagram命令及 completions、utils 注释### 表+- 列 (类型)列表），更直接省 token、无 mermaid 语法噪音；MAX_TABLES 截断保留commands/relations.ts/schema.ts/workspace.ts/db-tools.ts消费点 cast 全部封口为什么
裸 information_schema 行此前漏到 4+ 消费点，COLUMN_NAME 知识散布、cast 遍地、ER builder（命令层最逻辑密集代码）无法纯函数化且不可测。收窄后一个概念一个形状，加字段只改边界。
验证
npm run check（tsc）通过npm test229 通过（删 er-diagram completion 用例，schema-table 构造改类型化行）npm run lint0 errors（12 warnings 存量）npm run fmt+fmt:check通过