docs(cli): add knowledge base initialization and media import instructions

- Introduced a new section on knowledge base initialization with a dry-run option to preview setup.
- Added details on billing implications and cleanup actions for knowledge bases.
- Included instructions for importing documents into knowledge bases and managing media support.
- Updated both English and Chinese README files to ensure consistency and clarity in documentation.

Author: clark-fc

packages/cli/README.md

@@ -125,6 +125,18 @@ Once installed, just describe your task to your AI Agent — no need to assemble
 
 > More examples and scenarios: [Aliyun Model Studio CLI Site](https://bailian.console.aliyun.com/cli?source_channel=cli_github&)
 
+### Try a knowledge base
+
+With a valid API key and workspace, preview initialization first:
+
+```bash
+bl knowledge init --workspace-id <workspace-id> --dry-run
+```
+
+Knowledge bases accrue running-time charges from creation, even without queries. The one-time Standard Edition 720-hour allowance is shared across knowledge bases and expires 30 days after activation for new users. Model calls cost extra; your remaining allowance is unknown. Review the plan and [billing rules](https://help.aliyun.com/zh/model-studio/billing-for-knowledge-base), then add `--yes` to the same command **after confirming the operation**, removing `--dry-run` to execute.
+
+Keep the returned IDs and recovery record. Closing the CLI or a later failure does not stop billing; follow the reported cleanup actions to delete unused knowledge bases. See the [Knowledge Studio quick start](packages/kscli/README.md#quick-start) for retrieval and cleanup. The `bailian-knowledge` Skill is available through `bl skill init`.
+
 ## Authentication
 
 ### Console Login (OAuth, Recommended)
@@ -204,3 +216,7 @@ Memory documentation (Chinese): [capability matrix](https://github.com/modelstud
 | Get API Key                  | https://bailian.console.aliyun.com/cn-beijing/?source_channel=key_github&tab=app#/api-key |
 | Get Token Plan API Key       | https://bailian.console.aliyun.com/cn-beijing?tab=plan#/efm/subscription/overview         |
 | Get AccessKey                | https://ram.console.aliyun.com/manage/ak                                                  |
+
+### RAG audio and video
+
+`bl knowledge doc import --index-id <id> --doc-id <fileId>` imports an existing file into a knowledge base; `doc list --details` shows per-file processing settings. Media support includes parser options, streaming uploads, and media references in search/chunk output. Chat JSON separates the final answer from phases, tools, docs, usage, and raw events; quiet mode emits only the final answer. See the [command guide](docs/knowledge/knowledge-cli-guide.md).

packages/cli/README.zh.md

@@ -124,6 +124,18 @@ irm https://bailian.aliyun.com/cli/install.ps1 | iex
 
 > 更多案例与使用场景：[阿里云百炼 CLI 官方主页](https://bailian.console.aliyun.com/cli?source_channel=cli_github&)
 
+### 体验知识库
+
+准备有效的 API Key 和工作空间后，先预览初始化计划：
+
+```bash
+bl knowledge init --workspace-id <workspace-id> --dry-run
+```
+
+知识库创建成功即持续按时计费，即使没有检索也一样。标准版一次性 720 小时额度由多个知识库共享，新用户开通后 30 天内有效；模型调用另计，当前账户剩余额度未知。查看计划与[计费规则](https://help.aliyun.com/zh/model-studio/billing-for-knowledge-base)，**确认本次操作后**，在同一命令中去掉 `--dry-run` 并添加 `--yes` 执行。
+
+保留返回的 ID 和恢复记录。退出 CLI 或后续步骤失败不会停止计费；按返回的清理动作删除不再需要的知识库。检索及清理示例见 [Knowledge Studio 快速开始](packages/kscli/README.zh.md#快速开始)。知识库 Skill `bailian-knowledge` 通过 `bl skill init` 安装。
+
 ## 认证方式
 
 ### 控制台登录（OAuth，推荐）
@@ -203,3 +215,7 @@ Memory 用户文档：[能力矩阵](https://github.com/modelstudioai/cli/blob/m
 | 获取 API Key            | https://bailian.console.aliyun.com/cn-beijing/?source_channel=key_github&tab=app#/api-key |
 | 获取 Token Plan API Key | https://bailian.console.aliyun.com/cn-beijing?tab=plan#/efm/subscription/overview         |
 | 获取 AccessKey          | https://ram.console.aliyun.com/manage/ak                                                  |
+
+### RAG 音视频接入
+
+`bl knowledge doc import --index-id <id> --doc-id <fileId>` 将历史文件导入已有库；`doc list --details` 查看文件级处理参数。支持音视频 parser、流式上传，以及检索/切片中的媒体来源展示。问答 JSON 将最终 answer 与 phases/tools/docs/usage/events 分开保存，quiet 仅输出最终回答。参阅 [命令指南](docs/knowledge/knowledge-cli-guide.md)。