Structured logging infrastructure for Smith platform

This crate provides high-performance, structured logging with NATS integration for centralized log collection across all Smith platform services.

Features

• NATS Integration: Emit logs directly to NATS subjects for centralized collection
• Performance Optimized: Asynchronous logging with batching and buffering
• Structured Format: JSON logs with consistent fields and correlation IDs
• Configurable Filtering: Per-module, per-level filtering with target-based rules
• Graceful Fallback: Console logging when NATS is unavailable
• Rate Limiting: Prevent log flooding with configurable rate limits

Usage

use smith_logging::{init_logging, LoggingLayer};
use smith_config::Config;

// Initialize logging with NATS integration
let config = Config::development();
let _guard = init_logging(&config.logging, &config.nats, "smith-core").await?;

// Use standard tracing macros
tracing::info!("Service started");
tracing::warn!("High memory usage detected");
tracing::error!("Database connection failed");