Enhance email templates with clickable links, branding, and improved styling

- Add clickable gallery links in all email templates
- Include application logo in email header and footer (custom or PicPeak default)
- Redesign emails with professional styling matching gallery login page
  - Gray background with white content box
  - PicPeak green header with centered logo
  - Clean typography and proper spacing
  - Responsive design for mobile devices
  - Styled call-to-action buttons
  - Footer with branding and copyright
- Update email processor to fetch branding settings dynamically
- Use proper API URLs for logo images in emails

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

backend/migrations/014_add_host_name_to_events.js

@@ -0,0 +1,35 @@
+const { db } = require('../src/database/db');
+
+async function up() {
+  // Check if host_name column already exists
+  const hasHostName = await db.schema.hasColumn('events', 'host_name');
+  
+  if (!hasHostName) {
+    await db.schema.table('events', (table) => {
+      table.string('host_name').after('event_date');
+    });
+    
+    console.log('Added host_name column to events table');
+  }
+}
+
+async function down() {
+  await db.schema.table('events', (table) => {
+    table.dropColumn('host_name');
+  });
+}
+
+module.exports = { up, down };
+
+// Run migration if called directly
+if (require.main === module) {
+  up()
+    .then(() => {
+      console.log('Migration completed successfully');
+      process.exit(0);
+    })
+    .catch((error) => {
+      console.error('Migration failed:', error);
+      process.exit(1);
+    });
+}