✨ feat(chroma): 新增 Chroma 向量库连接支持

- 后端新增 Chroma REST 连接、元数据浏览、JSON/SELECT 查询与 upsert/delete 写入

- 前端新增 Chroma 类型、连接配置、图标、方言和能力矩阵

- 测试覆盖 v1/v2 兼容、真实服务 smoke 和前端配置

Refs #560

frontend/src/utils/sqlDialect.test.ts

@@ -30,6 +30,8 @@ describe('sqlDialect', () => {
     expect(resolveSqlDialect('custom', 'open_gauss')).toBe('opengauss');
     expect(resolveSqlDialect('Elasticsearch')).toBe('elasticsearch');
     expect(resolveSqlDialect('custom', 'elastic')).toBe('elasticsearch');
+    expect(resolveSqlDialect('ChromaDB')).toBe('chroma');
+    expect(resolveSqlDialect('custom', 'chroma-db')).toBe('chroma');
     expect(resolveSqlDialect('OceanBase', '', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
     expect(resolveSqlDialect('custom', 'oceanbase', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
     expect(isMysqlFamilyDialect('mariadb')).toBe(true);