feat: add PM2 configuration and deployment setup for remote server

- Add Makefile with convenient PM2 commands for development and production
- Add ecosystem.config.js with production/staging/dev environment configurations
- Add comprehensive PM2-GUIDE.md documentation for deployment
- Update package.json with PM2-specific npm scripts
- Fix Chrome extension URL handling to omit standard ports (443/80)
- Hide embedding model and semantic engine sections in popup UI

app/chrome-extension/entrypoints/popup/App.vue

@@ -384,7 +384,7 @@
         </div>
       </div>
 
-      <div class="section">
+      <div class="section" style="display: none">
         <h2 class="section-title">{{ getMessage('semanticEngineLabel') }}</h2>
         <div class="semantic-engine-card">
           <div class="semantic-engine-status">
@@ -416,7 +416,7 @@
         </div>
       </div>
 
-      <div class="section">
+      <div class="section" style="display: none">
         <h2 class="section-title">{{ getMessage('embeddingModelLabel') }}</h2>
 
         <ProgressIndicator