feat: add CNBChat adapter for CNB API integration

- Introduced CNBChat class in src/provider/chat-adapter/cnb.ts to handle interactions with the CNB API.
- Updated chat.ts to export CNBChat for use in the application.
- CNBChat includes methods for querying the CNB API with customizable parameters.

src/provider/chat-adapter/cnb.ts

@@ -0,0 +1,34 @@
+import { BaseChat, BaseChatOptions } from '../core/chat.ts';
+
+export type CNBOptions = Partial<BaseChatOptions>;
+export class CNBChat extends BaseChat {
+  static BASE_URL = 'https://api.cnb.cool/{repo}/-/ai';
+  constructor(options: CNBOptions & { repo: string }) {
+    const baseURL = CNBChat.BASE_URL.replace('{repo}', options.repo);
+    super({ ...(options as BaseChatOptions), baseURL: baseURL });
+  }
+  query({ repo, ...rest }: CNBQueryParam & { repo: string }) {
+    const baseURL = 'https://api.cnb.cool/{repo}/-/knowledge/base/query'
+      .replace('{repo}', repo);
+    this.post(baseURL, {
+      data: rest,
+    });
+  }
+}
+
+export type CNBQueryParam = {
+  query: string;
+  metadata_filtering_conditions?: {
+    conditions: Array<{
+      //  "position", "path", "type"
+      name: 'position' | 'path' | 'type';
+      value: string;
+      // "is", "is not", "contains", "not contains", "starts with", "ends with", "is empty", "is not empty"
+      comparison_operator: 'is' | 'is not' | 'contains' | 'not contains' | 'starts with' | 'ends with' | 'is empty' | 'is not empty';
+    }>;
+    // "and" 或 "or"，默认 "and"
+    logical_operator: 'and' | 'or';
+  },
+  score_threshold?: number;
+  top_k?: number;
+}