✨ feat(qdrant): 新增 Qdrant 向量库连接支持

- 后端新增 Qdrant REST 连接、collection 元数据、scroll/search 查询与 upsert/delete/payload 更新

- 前端新增 Qdrant 类型、连接配置、图标、方言和能力矩阵

- 测试覆盖 mock REST、真实服务 smoke 和前端配置

Refs #555

frontend/src/utils/sqlDialect.test.ts

@@ -32,6 +32,8 @@ describe('sqlDialect', () => {
     expect(resolveSqlDialect('custom', 'elastic')).toBe('elasticsearch');
     expect(resolveSqlDialect('ChromaDB')).toBe('chroma');
     expect(resolveSqlDialect('custom', 'chroma-db')).toBe('chroma');
+    expect(resolveSqlDialect('QdrantDB')).toBe('qdrant');
+    expect(resolveSqlDialect('custom', 'qdrant-db')).toBe('qdrant');
     expect(resolveSqlDialect('OceanBase', '', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
     expect(resolveSqlDialect('custom', 'oceanbase', { oceanBaseProtocol: 'oracle' })).toBe('oracle');
     expect(isMysqlFamilyDialect('mariadb')).toBe(true);