✨ 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/dataSourceCapabilities.test.ts

@@ -72,6 +72,24 @@ describe('dataSourceCapabilities', () => {
     });
   });
 
+  it('treats Chroma as a queryable vector datasource without SQL export actions', () => {
+    expect(getDataSourceCapabilities({ type: 'chroma' })).toMatchObject({
+      type: 'chroma',
+      supportsQueryEditor: true,
+      supportsSqlQueryExport: false,
+      supportsCopyInsert: false,
+      supportsCreateDatabase: false,
+      supportsRenameDatabase: false,
+      supportsDropDatabase: false,
+      forceReadOnlyQueryResult: false,
+    });
+    expect(getDataSourceCapabilities({ type: 'custom', driver: 'chromadb' })).toMatchObject({
+      type: 'chroma',
+      supportsQueryEditor: true,
+      supportsCopyInsert: false,
+    });
+  });
+
   it('treats OceanBase Oracle protocol as Oracle capabilities', () => {
     expect(getDataSourceCapabilities({
       type: 'oceanbase',