fix(registry): align OCI and RubyGems API behavior and improve npm search result ordering

ts/npm/classes.npmregistry.ts

@@ -749,6 +749,22 @@ export class NpmRegistry extends BaseRegistry {
       this.logger.log('error', 'handleSearch failed', { error: (error as Error).message });
     }
 
+    // Sort results by relevance: exact match first, then prefix match, then substring match
+    if (text) {
+      const lowerText = text.toLowerCase();
+      results.sort((a, b) => {
+        const aName = a.package.name.toLowerCase();
+        const bName = b.package.name.toLowerCase();
+        const aExact = aName === lowerText ? 0 : 1;
+        const bExact = bName === lowerText ? 0 : 1;
+        if (aExact !== bExact) return aExact - bExact;
+        const aPrefix = aName.startsWith(lowerText) ? 0 : 1;
+        const bPrefix = bName.startsWith(lowerText) ? 0 : 1;
+        if (aPrefix !== bPrefix) return aPrefix - bPrefix;
+        return aName.localeCompare(bName);
+      });
+    }
+
     // Apply pagination
     const paginatedResults = results.slice(from, from + size);