[Cross-cutting] Create examples demonstrating real-world use cases

[konard]

Summary

Create comprehensive examples demonstrating real-world use cases of Links Queue for both JavaScript and Rust.

Background

Examples help users understand how to use Links Queue effectively. They should showcase the unique link-based data model and various operating modes.

Requirements

Basic Examples (can be done early, after Phase 1-2)

1. Hello World - Simple enqueue/dequeue
2. Link Relationships - Demonstrating nested links and graph structures
3. Producer-Consumer - Basic work queue pattern
4. Deduplication - Showing automatic link deduplication

Intermediate Examples (after Phase 3)

5. Persistent Queue - Using link-cli backend for durability
6. Dead Letter Queue - Handling failed messages
7. Retry with Backoff - Implementing retry logic
8. Priority Queue - Processing by priority

Advanced Examples (after Phase 5-6)

9. Client-Server - Connecting to Links Queue server
10. Multi-Node - Distributed queue across nodes
11. Fan-out Pattern - Publishing to multiple consumers
12. Workflow - Chaining queue operations

Example Structure

examples/
├── js/
│   ├── 01-hello-world/
│   │   ├── README.md
│   │   └── index.ts
│   ├── 02-link-relationships/
│   ├── 03-producer-consumer/
│   └── ...
└── rust/
    ├── 01-hello-world/
    │   ├── README.md
    │   └── main.rs
    ├── 02-link-relationships/
    └── ...

Each Example Should Include

• README.md with explanation
• Runnable code
• Expected output
• Key concepts highlighted

Deliverables

1. Basic examples (1-4) for JavaScript
2. Basic examples (1-4) for Rust
3. Intermediate examples (5-8) for JavaScript
4. Intermediate examples (5-8) for Rust
5. Advanced examples (9-12) for JavaScript
6. Advanced examples (9-12) for Rust

Dependencies

• Basic examples: [Phase 1] Define Link and LinkStore interfaces/traits (API Contract) #7, [Phase 1] Implement in-memory LinkStore backend (JavaScript) #8, [Phase 1] Implement in-memory LinkStore backend (Rust) #9, [Phase 2] Implement basic Queue and QueueManager (JavaScript) #11, [Phase 2] Implement basic Queue and QueueManager (Rust) #12
• Intermediate examples: [Phase 3] Define StorageBackend interface/trait (API Contract) #13, [Phase 3] Implement link-cli storage backend (JavaScript) #14, [Phase 3] Implement link-cli storage backend (Rust) #15
• Advanced examples: [Phase 5] Implement TCP server mode (JavaScript) #17, [Phase 5] Implement TCP server mode (Rust) #18, [Phase 6] Implement multi-node clustering (JavaScript) #20, [Phase 6] Implement multi-node clustering (Rust) #21

Can Be Worked On Independently

Each example can be created independently as features are completed.

References

• ROADMAP.md - Priority areas for contribution
• code-architecture-principles