✨ 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.ts

@@ -30,6 +30,7 @@ export type SqlDialect =
   | 'mongodb'
   | 'redis'
   | 'elasticsearch'
+  | 'chroma'
   | 'unknown'
   | string;
 
@@ -115,6 +116,10 @@ export const resolveSqlDialect = (
       return source;
     case 'elastic':
       return 'elasticsearch';
+    case 'chromadb':
+    case 'chroma-db':
+    case 'chroma':
+      return 'chroma';
     default:
       break;
   }
@@ -140,6 +145,7 @@ export const resolveSqlDialect = (
   if (source.includes('sqlserver') || source.includes('mssql')) return 'sqlserver';
   if (source.includes('iris') || source.includes('intersystems')) return 'iris';
   if (source.includes('elastic')) return 'elasticsearch';
+  if (source.includes('chroma')) return 'chroma';
 
   return source;
 };