fix(update): normalize version strings for correct comparison

The version check was comparing "4.0.8" (no prefix) with "v4.0.8"
(with prefix), causing it to always think an update was available.

Now both versions are normalized to have the "v" prefix before
comparison, so "Already up to date!" works correctly.

deno.json

@@ -1,6 +1,6 @@
 {
   "name": "@serve.zone/nupst",
-  "version": "4.0.8",
+  "version": "4.0.9",
   "exports": "./mod.ts",
   "tasks": {
     "dev": "deno run --allow-all mod.ts",

ts/cli/service-handler.ts

@@ -145,12 +145,16 @@ export class ServiceHandler {
         const release = JSON.parse(response);
         const latestVersion = release.tag_name; // e.g., "v4.0.7"
 
-        logger.dim(`Current version: ${currentVersion}`);
-        logger.dim(`Latest version:  ${latestVersion}`);
+        // Normalize versions for comparison (ensure both have "v" prefix)
+        const normalizedCurrent = currentVersion.startsWith('v') ? currentVersion : `v${currentVersion}`;
+        const normalizedLatest = latestVersion.startsWith('v') ? latestVersion : `v${latestVersion}`;
+
+        logger.dim(`Current version: ${normalizedCurrent}`);
+        logger.dim(`Latest version:  ${normalizedLatest}`);
         console.log('');
 
-        // Compare versions (both are in format "v4.0.7")
-        if (currentVersion === latestVersion) {
+        // Compare normalized versions
+        if (normalizedCurrent === normalizedLatest) {
           logger.success('Already up to date!');
           console.log('');
           return;