feat: 新增 Datacircle 领英档案查询工具

tools/tool_datacircle/README.md

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+## datacircle_linkedin_profile
+
+**Author:** Datacircle
+**Version:** 1.0.0
+**Type:** tool
+
+## Introduction
+
+Datacircle is a data co-op. Query your favorite B2B data APIs through us. Same request, same price, no markup. Every morning, you get the flat file of your data plus everyone else's.
+
+This tool looks up a LinkedIn profile by its URL through us. Each request goes to the provider and gets the profile as it is today.
+
+Right now we have 3 live LinkedIn profile APIs that we trust: Up2Data, HarvestAPI and Fetchin.
+
+## Offer
+
+Sign up at datacircle.dev with your work email: a $5 credit, that's 2,105 LinkedIn profiles at $2.375 per 1,000.
+
+## Setup
+
+1. Log in at [datacircle.dev/login](https://datacircle.dev/login) with your work email. Your API key is on the page once you're in.
+2. In MaxKB, add this tool from the Tool Store, paste the key into **API Key**, and enable it.
+
+## Parameters
+
+| Name | Required | Meaning |
+|---|---|---|
+| `linkedin_url` | yes | the profile's LinkedIn URL, e.g. `https://www.linkedin.com/in/williamhgates` |
+| `provider` | no | `up2data` (the default), `harvestapi` or `fetchin` |
+
+The answer is the provider's own JSON, plus `datacircle_meta`: `cost_usd` (what this call cost) and `balance_usd` (what you have left). A call your balance can't cover answers 402. Add funds, from $5, on your dashboard.
+
+## Prices
+
+$2.375 per 1,000 through Up2Data (a profile it can't find is free), $3.70 per 1,000 through HarvestAPI.
+$1.485 per 1,000 through Fetchin, a profile it can't find billed the same.
+
+Today's prices: [docs.datacircle.dev/pricing](https://docs.datacircle.dev/pricing).
+
+## 中文说明
+
+Datacircle 是一个数据合作社。通过我们调用你常用的 B2B 数据 API：同样的请求，同样的价格，零加价。本工具按 URL 实时查询领英（LinkedIn）个人档案，经 Up2Data（默认）、HarvestAPI 或 Fetchin。
+
+1. 在 [datacircle.dev/login](https://datacircle.dev/login) 用工作邮箱登录，页面上即有 API Key（注册赠送 $5 额度，即 2,105 条领英档案，每 1,000 条 $2.375）。
+2. 在 MaxKB 工具商店添加本工具，在 **API Key** 中填入，启用即可。
+3. 参数：`linkedin_url`（必填，领英个人档案 URL）；`provider`（选填，`up2data` 默认，`harvestapi` 或 `fetchin`）。
+
+## Links
+
+- Docs: https://docs.datacircle.dev
+- Website: https://datacircle.dev
+- Contact: wayne@datacircle.dev

tools/tool_datacircle/data.yaml

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+name: Datacircle 领英档案查询
+tags:
+  - 接口工具
+title: 通过 Datacircle 按 URL 实时查询领英个人档案
+description: Datacircle 是一个数据合作社。通过我们调用你常用的 B2B 数据 API：同样的请求，同样的价格，零加价。本工具按 URL 实时查询领英（LinkedIn）个人档案，经 Up2Data（默认）、HarvestAPI 或 Fetchin。