Add web search microservice with multi-provider aggregation

[konard]

Summary

• Add multi-provider web search aggregation (Google, DuckDuckGo, Bing)
• Implement result merger with RRF, weighted, and interleave strategies
• Add browser-commander integration for direct browser search testing
• Create REST API microservice with Express.js (JavaScript) and Axum (Rust)
• Add CLI tool for command-line usage

Details

JavaScript Library

• Multi-provider search with API-first design and scraping fallback
• Result merger with three strategies: Reciprocal Rank Fusion (RRF), weighted scoring, interleaving
• URL normalization for proper deduplication across providers
• Express.js REST API server with comprehensive endpoints
• CLI tool (web-search) for command-line usage
• browser-commander integration for browser-based search testing

Rust Library

• Async search providers using reqwest and scraper
• Same merge strategies as JavaScript implementation
• Axum REST API server
• CLI with clap argument parsing
• Cross-platform support (Linux, macOS, Windows)

REST API Endpoints

• GET /search?q=<query> - Search all providers
• POST /search - Search with options in body
• GET /search/:provider?q=<query> - Search single provider
• GET /providers - List available providers
• GET /health - Health check

CI/CD

• Added rust.yml workflow for Rust CI (lint, test matrix, build)

Test plan

• All 22 unit tests passing
• Linting passes with zero warnings
• Rust code compiles and passes clippy
• TypeScript definitions complete

Fixes #1

🤖 Generated with Claude Code

[konard]

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💰 Cost estimation:

• Public pricing estimate: $12.831142 USD
• Calculated by Anthropic: $9.558967 USD
• Difference: $-3.272176 (-25.50%)
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