fix: Simplify localhost detection and add early metrics support

- License/Manager: Simplify localhost TLD detection to .localhost and .local
- Prometheus/Integration: Add collect_early_metrics() for wp-prometheus early mode

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

includes/License/Manager.php

@@ -443,23 +443,25 @@ final class Manager {
 	public static function is_localhost(): bool {
 		$host = wp_parse_url( home_url(), PHP_URL_HOST );
 
-		// Common localhost identifiers.
-		$localhost_hosts = array(
+		$localhost_patterns = array(
 			'localhost',
 			'127.0.0.1',
 			'::1',
 		);
 
-		if ( in_array( $host, $localhost_hosts, true ) ) {
+		// Check exact matches.
+		if ( in_array( $host, $localhost_patterns, true ) ) {
 			return true;
 		}
 
-		// Common local development TLDs.
-		$local_tlds = array( '.local', '.test', '.localhost', '.dev.local' );
-		foreach ( $local_tlds as $tld ) {
-			if ( str_ends_with( $host, $tld ) ) {
-				return true;
-			}
+		// Check .localhost TLD (e.g., mysite.localhost).
+		if ( str_ends_with( $host, '.localhost' ) ) {
+			return true;
+		}
+
+		// Check .local TLD (common for local development).
+		if ( str_ends_with( $host, '.local' ) ) {
+			return true;
 		}
 
 		return false;