[Discovery] duckduckgo-mcp-server - DuckDuckGo Search

## Project Association

This issue tracks the `duckduckgo` MCP server in the core profile.

### Server Details
- **Name**: duckduckgo
- **Source**: https://github.com/nickclyde/duckduckgo-mcp-server
- **Category**: search
- **Language**: TypeScript/Node.js

### Transport Status
- **Current**: Native HTTP support
- **Implementation**: Custom build with HTTP transport args
- **Docker Image**: `duckduckgo-mcp:http` (custom build)

### Tools Provided
- `search`: Search DuckDuckGo and return formatted results
- `fetch_content`: Fetch and parse content from a webpage URL

### Docker Status
- No official Docker image
- Custom build: `duckduckgo.dockerfile`
- HADOLint: Not checked

### Notes
- Community-maintained server
- Privacy-focused search alternative
- Simple and lightweight

### Tracking
- [ ] Document search parameters
- [ ] HADOLint compliance check
- [ ] Consider Rust rewrite
- [ ] Monitor upstream for updates