feat: 新增 Instagram、LinkedIn、Boss直聘 三个渠道

新增渠道：
- Instagram: 基于 instaloader (⭐9.8K)，读取帖子/Profile，Cookie 登录
- LinkedIn: 基于 linkedin-scraper-mcp (⭐900+) MCP 服务，Jina Reader fallback
- Boss直聘: 基于 mcp-bosszp MCP 服务，Jina Reader fallback

代码改动：
- 新建 channels/instagram.py, linkedin.py, bosszhipin.py
- 注册到 channels/__init__.py
- cli.py 添加 search-instagram/linkedin/bosszhipin 子命令
- cli.py 安装逻辑添加 instaloader 自动安装
- core.py 添加 search_instagram/linkedin/bosszhipin 方法
- README.md + docs/README_en.md 更新平台表格和选型表格
- docs/install.md 添加三个新渠道的配置说明和 Quick Reference

docs/README_en.md

@@ -58,6 +58,9 @@ Copy that to your Agent. A few minutes later, it can read tweets, search Reddit,
 | 🌐 **Web** | Read | Zero config | Any URL → clean Markdown ([Jina Reader](https://github.com/jina-ai/reader) ⭐9.8K) |
 | 🐦 **Twitter/X** | Read · Search | Zero config / Cookie | Single tweets readable out of the box. Cookie unlocks search, timeline, posting ([bird](https://github.com/steipete/bird)) |
 | 📕 **XiaoHongShu** | Read · Search · **Post · Comment · Like** | mcporter | Via [xiaohongshu-mcp](https://github.com/user/xiaohongshu-mcp) internal API, install and go |
+| 📷 **Instagram** | Read · Search | instaloader | Posts, profiles, hashtags ([instaloader](https://github.com/instaloader/instaloader) ⭐9.8K) |
+| 💼 **LinkedIn** | Read · Search | mcporter / Jina | Profiles, companies, job search ([linkedin-scraper-mcp](https://github.com/stickerdaniel/linkedin-mcp-server) ⭐900+) |
+| 🏢 **Boss直聘** | Read · Search | mcporter / Jina | Job search, greet recruiters ([mcp-bosszp](https://github.com/mucsbr/mcp-bosszp)) |
 | 🔍 **Web Search** | Search | Auto-configured | Auto-configured during install, free, no API key ([Exa](https://exa.ai) via [mcporter](https://github.com/nicepkg/mcporter)) |
 | 📦 **GitHub** | Read · Search | Zero config | [gh CLI](https://cli.github.com) powered. Public repos work immediately. `gh auth login` unlocks Fork, Issue, PR |
 | 📺 **YouTube** | Read · **Search** | Zero config | Subtitles + search across 1800+ video sites ([yt-dlp](https://github.com/yt-dlp/yt-dlp) ⭐148K) |
@@ -182,6 +185,9 @@ channels/
 ├── bilibili.py     → yt-dlp           ← swap to bilibili-api…
 ├── reddit.py       → JSON API + Exa  ← swap to PRAW, Pushshift…
 ├── xiaohongshu.py  → mcporter MCP    ← swap to other XHS tools…
+├── instagram.py    → instaloader     ← swap to instagrapi, official API…
+├── linkedin.py     → linkedin-mcp    ← swap to LinkedIn API…
+├── bosszhipin.py   → mcp-bosszp      ← swap to other job tools…
 ├── rss.py          → feedparser       ← swap to atoma…
 ├── exa_search.py   → mcporter MCP    ← swap to Tavily, SerpAPI…
 └── __init__.py     → Channel registry
@@ -198,6 +204,9 @@ channels/
 | GitHub | [gh CLI](https://cli.github.com) | Official tool, full API after auth |
 | Read RSS | [feedparser](https://github.com/kurtmckee/feedparser) | Python ecosystem standard, 2.3K stars |
 | XiaoHongShu | [xiaohongshu-mcp](https://github.com/user/xiaohongshu-mcp) | Internal API, bypasses anti-bot |
+| Instagram | [instaloader](https://github.com/instaloader/instaloader) | 9.8K stars, Python CLI, cookie auth, free |
+| LinkedIn | [linkedin-scraper-mcp](https://github.com/stickerdaniel/linkedin-mcp-server) | 900+ stars, MCP server, browser automation |
+| Boss直聘 | [mcp-bosszp](https://github.com/mucsbr/mcp-bosszp) | MCP server, job search + recruiter greeting |
 
 > 📌 These are the *current* choices. Don't like one? Swap out the file. That's the whole point of scaffolding.
 

docs/install.md

@@ -69,7 +69,44 @@ mcporter config add xiaohongshu http://localhost:18060/mcp
 > 如果在服务器上，建议加代理避免 IP 风控：
 > `docker run -d --name xiaohongshu-mcp -p 18060:18060 -e XHS_PROXY=http://user:pass@ip:port xpzouying/xiaohongshu-mcp`
 >
-> 首次使用需要扫码登录，打开 http://localhost:18060 操作。
+> **登录方式：**
+> - **本地电脑（有浏览器）：** 打开 http://localhost:18060 扫码登录即可。
+> - **服务器（无 UI 界面）：** 服务器上通常没有浏览器，无法直接扫码。最方便的方式是在自己的电脑上用浏览器登录小红书，然后用 [Cookie-Editor](https://chromewebstore.google.com/detail/cookie-editor/hlkenndednhfkekhgcdicdfddnkalmdm) 插件导出 Cookie（Header String 格式），发给 Agent 即可完成配置。详见 [Cookie 导出指南](cookie-export.md)。
+
+**Instagram (需要 instaloader):**
+> "Instagram 需要 instaloader。我来帮你安装。"
+
+```bash
+pip install instaloader
+```
+
+> 登录后可访问更多内容（私密帖子等）：`instaloader --login YOUR_USERNAME`
+> 服务器用户同样可以在本地电脑登录后，导出 Cookie 发给 Agent。
+
+**LinkedIn (可选 — linkedin-scraper-mcp):**
+> "LinkedIn 基本内容可通过 Jina Reader 读取。完整功能（Profile 详情、职位搜索）需要 linkedin-scraper-mcp。"
+
+```bash
+pip install linkedin-scraper-mcp
+uvx linkedin-scraper-mcp --login       # 首次需在有浏览器的机器上登录
+uvx linkedin-scraper-mcp --transport streamable-http --port 8001  # 启动 MCP 服务
+mcporter config add linkedin http://localhost:8001/mcp
+```
+
+> 详见 https://github.com/stickerdaniel/linkedin-mcp-server
+
+**Boss直聘 (可选 — mcp-bosszp):**
+> "Boss直聘职位页面可直接读取。完整搜索和打招呼功能需要 mcp-bosszp。"
+
+```bash
+git clone https://github.com/mucsbr/mcp-bosszp.git && cd mcp-bosszp
+pip install -r requirements.txt && playwright install chromium
+python boss_zhipin_fastmcp_v2.py        # 启动 MCP 服务
+mcporter config add bosszhipin http://localhost:8000/mcp
+```
+
+> 或用 Docker：`docker-compose up -d`
+> 详见 https://github.com/mucsbr/mcp-bosszp
 
 ### Step 4: Final check
 
@@ -112,3 +149,6 @@ If the user wants a different agent to handle it, let them choose.
 | `agent-reach search-youtube "query"` | Search YouTube |
 | `agent-reach search-bilibili "query"` | Search Bilibili |
 | `agent-reach search-xhs "query"` | Search XiaoHongShu |
+| `agent-reach search-instagram "query"` | Search Instagram |
+| `agent-reach search-linkedin "query"` | Search LinkedIn |
+| `agent-reach search-bosszhipin "query"` | Search Boss直聘 |