feat(smartnetwork): Add randomizable port search and switch DNS resolution to @push.rocks/smartdns; export smartdns and update docs

readme.md

@@ -17,9 +17,9 @@ pnpm install @push.rocks/smartnetwork --save
 ### ✨ Key Features
 
 - **🏎️ Speed Testing** - Measure download/upload speeds using Cloudflare's infrastructure
-- **🔌 Port Management** - Check local/remote port availability, find free ports
+- **🔌 Port Management** - Check local/remote port availability, find free ports (sequential or random)
 - **📡 Connectivity Testing** - Ping hosts, trace routes, check endpoints
-- **🌍 DNS Operations** - Resolve A, AAAA, and MX records
+- **🌍 DNS Operations** - Resolve A, AAAA, and MX records with smart local/remote resolution
 - **🔍 Network Discovery** - Get network interfaces, gateways, public IPs
 - **⚡ Performance Caching** - Built-in caching for expensive operations
 - **🔧 Plugin Architecture** - Extend functionality with custom plugins
@@ -87,7 +87,7 @@ Automatically discover available ports:
 
 ```typescript
 const findFreePort = async () => {
-  // Find a free port between 3000 and 3100
+  // Find a free port between 3000 and 3100 (sequential - returns first available)
   const freePort = await network.findFreePort(3000, 3100);
   
   if (freePort) {
@@ -95,6 +95,10 @@ const findFreePort = async () => {
   } else {
     console.log('😢 No free ports available in range');
   }
+  
+  // Find a random free port in range (useful to avoid port conflicts)
+  const randomPort = await network.findFreePort(3000, 3100, { randomize: true });
+  console.log(`🎲 Random free port: ${randomPort}`);
 };
 ```
 
@@ -175,7 +179,7 @@ hops.forEach(hop => {
 
 ### 🌍 DNS Operations
 
-Resolve various DNS record types:
+Resolve various DNS record types using @push.rocks/smartdns with intelligent resolution strategy:
 
 ```typescript
 const dnsRecords = await network.resolveDns('example.com');
@@ -188,8 +192,14 @@ console.log('  AAAA records:', dnsRecords.AAAA);  // IPv6 addresses
 dnsRecords.MX.forEach(mx => {
   console.log(`  📧 Mail server: ${mx.exchange} (priority: ${mx.priority})`);
 });
+
+// Properly handles local hostnames (localhost, etc.)
+const localDns = await network.resolveDns('localhost');
+console.log('  Localhost:', localDns.A);  // Returns ['127.0.0.1']
 ```
 
+*DNS resolution uses a `prefer-system` strategy: tries system resolver first (respects /etc/hosts and local DNS), with automatic fallback to Cloudflare DoH for external domains.*
+
 ### 🏥 HTTP/HTTPS Health Checks
 
 Monitor endpoint availability and response times:
@@ -321,6 +331,10 @@ interface SmartNetworkOptions {
   cacheTtl?: number;  // Cache TTL in milliseconds
 }
 
+interface IFindFreePortOptions {
+  randomize?: boolean;  // If true, returns a random free port instead of the first one
+}
+
 interface Hop {
   ttl: number;        // Time to live
   ip: string;         // IP address of the hop