docs: add missing adapter docs for jd and web (#349)

Add documentation for jd (item) and web (read) adapters to fix
doc-coverage CI check (55/57 → 57/57).

Author: jackwener

docs/adapters/browser/jd.md

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+# JD.com
+
+**Mode**: 🔐 Browser · **Domain**: `item.jd.com`
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `opencli jd item <sku>` | Fetch product details (price, images, specs) |
+
+## Usage Examples
+
+```bash
+# Get product details by SKU
+opencli jd item 100291143898
+
+# Limit detail images
+opencli jd item 100291143898 --images 5
+
+# JSON output
+opencli jd item 100291143898 -f json
+```
+
+## Prerequisites
+
+- Chrome running and **logged into** jd.com
+- [Browser Bridge extension](/guide/browser-bridge) installed

docs/adapters/browser/web.md

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+# Web
+
+**Mode**: 🔐 Browser · **Domain**: any URL
+
+## Commands
+
+| Command | Description |
+|---------|-------------|
+| `opencli web read <url>` | Fetch any web page and export as Markdown |
+
+## Usage Examples
+
+```bash
+# Read a web page and save as Markdown
+opencli web read https://example.com/article
+
+# Custom output directory
+opencli web read https://example.com/article --output ./my-articles
+
+# Skip image download
+opencli web read https://example.com/article --download-images false
+
+# JSON output
+opencli web read https://example.com/article -f json
+```
+
+## Prerequisites
+
+- Chrome running
+- [Browser Bridge extension](/guide/browser-bridge) installed