chore(branding): rebrand FixMate to CityPulse across codebase

- Update product name in README, backend docs, and design tokens
- Rename Flutter root widget to CityPulseApp and update tests
- Update dashboard brand strings and HTML title
- Refresh i18n strings (en/ms) and welcome taglines
- Adjust backend API title/description and root message
- Minor formatting in ApiService comments; no logic changes
- Update Android/iOS manifest comments and pubspec description

No API endpoints or response schema changes.

dashboard/app.js

@@ -430,7 +430,7 @@ const cycleStatus = async (reportId) => {
   return (
     <div className="app-root">
       <header className="header">
-        <div className="brand">{t('dashboard.brand') || 'FixMate'}</div>
+        <div className="brand">{t('dashboard.brand') || 'CityPulse'}</div>
         <div className="lang-toggle">
           <label style={{fontSize:12, color:'#374151'}}>{t('label.language') || 'Language'}</label>
           <select value={lang} onChange={e=>setLang(e.target.value)}>