v1.5.0: Enterprise Features, Resiliency, and Dashboard Revamp

Added

• Dead Letter Queues (DLQ): Introduced automatic isolation for "poison pill" messages. Messages that fail to process 3 times via the SDK are now safely routed to a {topic}.dlq queue to prevent pipeline blocking.
• Time-Based Routing (TTL & Delay): Added native support for scheduled messages (?delay=X) and Lazy Expiration (?ttl=X) without introducing background polling threads.
• Consumer Batching / Prefetch: Implemented multi-message extraction (?limit=X). Consumers can now fetch arrays of messages in a single HTTP request, drastically reducing network overhead.
• Broadcast Mode (Fan-out): Added ephemeral pub/sub capabilities (?broadcast=true) to dispatch a single event to multiple independent consumers simultaneously.
• Push Consumers (Webhooks): Implemented native passive integration. The broker can now be configured (/webhook/{topic}) to automatically POST new messages to external URLs (Fire-and-Forget).
• Manual Topic Creation: Added a secure API endpoint (/api/topics) to pre-initialize topics safely, enforcing alphanumeric regex validation and idempotency.

Changed

• Interactive Dashboard: Completely revamped the embedded UI (/dashboard). It now features Vanilla JS Auto-Refresh, Uptime tracking, Webhook indicators, DLQ badges, and a manual topic creation interface—all remaining under 1KB of JS/CSS.
• Go SDK (client/client.go): Upgraded the worker subscription model. It now handles exponential backoff (1s to 32s) and automatically calls the new /requeue endpoint when a handler returns an error to preserve the retry count.
• Core Engine: Refactored the internal Publish and Consume methods to support arrays, batching, and delayed message skipping without locking the global mutex.
• Documentation: Fully updated README.md and DOCUMENTATION.md to reflect the new enterprise-grade features while retaining the ~25MB image size and zero-dependency promises.

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