[Cross-cutting] Create API documentation and usage guides

[konard]

Summary

This PR adds comprehensive API documentation and usage guides for Links Queue, addressing issue #24.

Documentation Structure

docs/
├── README.md                    # Documentation index
├── api/
│   ├── js/README.md            # Complete JavaScript API reference
│   └── rust/README.md          # Complete Rust API reference  
└── guides/
    ├── getting-started.md      # Quick start guide
    ├── core-concepts.md        # Links, queues, patterns
    ├── operating-modes.md      # Single/multi-node modes
    ├── storage-backends.md     # Memory, link-cli, custom
    ├── server-mode.md          # TCP server/client
    ├── clustering.md           # Distributed deployment
    └── best-practices.md       # Production tips

Added Documentation

• Getting Started: Installation instructions, quick start examples for JS and Rust
• Core Concepts: Links data model, queue semantics, pattern matching, delivery guarantees
• Operating Modes: Single-memory, single-stored, multi-memory, multi-stored configurations
• Storage Backends: Memory backend, link-cli backend, custom backend creation guide
• Server Mode: TCP server setup, client connection, protocol reference
• Clustering: Multi-node setup, gossip protocol, partitioning, replication
• Best Practices: Error handling, performance tuning, monitoring, Kubernetes deployment
• JavaScript API Reference: Complete type documentation with examples
• Rust API Reference: Trait and struct documentation with examples

Test plan

• All documentation files created per issue requirements
• Files formatted with Prettier
• Cross-references between documents verified
• Code examples match actual API

Closes #24

🤖 Generated with Claude Code

[konard]

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