feat: Passwordless cross-device authentication

- Arkitektur: docs/auth/passwordless-architecture.md
- Backend: iom/quixzoom-auth-service/ (FastAPI + Redis)
- Webb: quixzoom-market-pages/se/login/ (QR-kod + polling)
- App: iom/quixzoom-app/src/features/auth/ (push + deep links)

Flöde: QR-kod → app-godkännande → webb-inloggad

academy-language-switcher.js

@@ -0,0 +1,136 @@
+// Academy Language Switcher
+// Växlar mellan engelska och svenska
+
+class LanguageSwitcher {
+  constructor() {
+    this.currentLang = localStorage.getItem('academyLang') || 'en';
+    this.translations = {
+      en: {
+        title: 'quiXzoom Academy',
+        subtitle: 'Master the skills to become a top-earning Zoomer',
+        module: 'Module',
+        lesson: 'Lesson',
+        back: '← Back',
+        academy: 'Academy',
+        gettingStarted: 'Getting Started',
+        photoQuality: 'Photo Quality',
+        missionTypes: 'Mission Types',
+        advancedTechniques: 'Advanced Techniques',
+        earningMore: 'Earning More',
+        proZoomer: 'Pro Zoomer',
+        welcome: 'Welcome to quiXzoom',
+        firstMission: 'Your First Mission',
+        photoBasics: 'Photo Basics',
+        submittingWork: 'Submitting Your Work',
+        lightingAngles: 'Lighting & Angles',
+        compositionRules: 'Composition Rules',
+        focusClarity: 'Focus & Clarity',
+        commonMistakes: 'Common Mistakes',
+        infrastructure: 'Infrastructure',
+        propertyRealEstate: 'Property & Real Estate',
+        commercialRetail: 'Commercial & Retail',
+        gpsLocation: 'GPS & Location Data',
+        multipleAngles: 'Multiple Angles',
+        documentationStandards: 'Documentation Standards',
+        missionSelection: 'Mission Selection',
+        efficiencyTips: 'Efficiency Tips',
+        buildingReputation: 'Building Reputation',
+        qualityAssurance: 'Quality Assurance',
+        troubleshooting: 'Troubleshooting',
+        safetyEthics: 'Safety & Ethics',
+        graduation: 'Graduation',
+        footer: 'quiXzoom Academy — Learn. Earn. Grow.',
+        switchToSwedish: '🇸🇪 Svenska',
+        switchToEnglish: '🇬🇧 English'
+      },
+      sv: {
+        title: 'quiXzoom Academy',
+        subtitle: 'Bemästra färdigheterna för att bli en topputbildad Zoomer',
+        module: 'Modul',
+        lesson: 'Lektion',
+        back: '← Tillbaka',
+        academy: 'Academy',
+        gettingStarted: 'Komma Igång',
+        photoQuality: 'Fotokvalitet',
+        missionTypes: 'Uppdragstyper',
+        advancedTechniques: 'Avancerade Tekniker',
+        earningMore: 'Tjäna Mer',
+        proZoomer: 'Pro Zoomer',
+        welcome: 'Välkommen till quiXzoom',
+        firstMission: 'Ditt Första Uppdrag',
+        photoBasics: 'Fotobasics',
+        submittingWork: 'Skicka In Ditt Arbete',
+        lightingAngles: 'Ljus & Vinklar',
+        compositionRules: 'Kompositionsregler',
+        focusClarity: 'Fokus & Klarhet',
+        commonMistakes: 'Vanliga Misstag',
+        infrastructure: 'Infrastruktur',
+        propertyRealEstate: 'Fastighet & Bostad',
+        commercialRetail: 'Kommersiell & Detaljhandel',
+        gpsLocation: 'GPS & Platsdata',
+        multipleAngles: 'Flera Vinklar',
+        documentationStandards: 'Dokumentationsstandarder',
+        missionSelection: 'Uppdragsval',
+        efficiencyTips: 'Effektivitetstips',
+        buildingReputation: 'Bygga Rykte',
+        qualityAssurance: 'Kvalitetssäkring',
+        troubleshooting: 'Felsökning',
+        safetyEthics: 'Säkerhet & Etik',
+        graduation: 'Examination',
+        footer: 'quiXzoom Academy — Lär. Tjäna. Väx.',
+        switchToSwedish: '🇸🇪 Svenska',
+        switchToEnglish: '🇬🇧 English'
+      }
+    };
+  }
+
+  init() {
+    this.renderSwitcher();
+    this.applyLanguage();
+  }
+
+  renderSwitcher() {
+    const switcher = document.createElement('div');
+    switcher.className = 'language-switcher';
+    switcher.innerHTML = `
+      <button class="lang-btn ${this.currentLang === 'en' ? 'active' : ''}" onclick="langSwitcher.setLanguage('en')">
+        🇬🇧 EN
+      </button>
+      <button class="lang-btn ${this.currentLang === 'sv' ? 'active' : ''}" onclick="langSwitcher.setLanguage('sv')">
+        🇸🇪 SV
+      </button>
+    `;
+    
+    // Lägg till i nav
+    const nav = document.querySelector('.nav');
+    if (nav) {
+      nav.appendChild(switcher);
+    }
+  }
+
+  setLanguage(lang) {
+    this.currentLang = lang;
+    localStorage.setItem('academyLang', lang);
+    location.reload();
+  }
+
+  applyLanguage() {
+    const t = this.translations[this.currentLang];
+    
+    // Uppdatera titlar
+    document.querySelectorAll('[data-i18n]').forEach(el => {
+      const key = el.dataset.i18n;
+      if (t[key]) {
+        el.textContent = t[key];
+      }
+    });
+  }
+
+  getText(key) {
+    return this.translations[this.currentLang][key] || key;
+  }
+}
+
+// Initiera
+const langSwitcher = new LanguageSwitcher();
+document.addEventListener('DOMContentLoaded', () => langSwitcher.init());