Fix language setting not being saved to database on admin settings page

- Added default_language field to general settings state in SettingsPage
- Replaced LanguageSelector component with simple select dropdown on settings page
- Fixed public settings endpoint to read general_default_language from database
- Language setting now properly saved when clicking Save Settings button
- Setting is correctly used by gallery login page and legal pages

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

Co-Authored-By: Claude <noreply@anthropic.com>

backend/src/routes/adminCategories.js

@@ -0,0 +1,182 @@
+const express = require('express');
+const { body, validationResult } = require('express-validator');
+const { db, logActivity } = require('../database/db');
+const { adminAuth } = require('../middleware/auth');
+const router = express.Router();
+
+// Get all global categories
+router.get('/global', adminAuth, async (req, res) => {
+  try {
+    const categories = await db('photo_categories')
+      .where('is_global', true)
+      .orderBy('name', 'asc');
+    
+    res.json(categories);
+  } catch (error) {
+    console.error('Error fetching categories:', error);
+    res.status(500).json({ error: 'Failed to fetch categories' });
+  }
+});
+
+// Get categories for a specific event (global + event-specific)
+router.get('/event/:eventId', adminAuth, async (req, res) => {
+  try {
+    const { eventId } = req.params;
+    
+    const categories = await db('photo_categories')
+      .where(function() {
+        this.where('is_global', true)
+          .orWhere('event_id', eventId);
+      })
+      .orderBy('is_global', 'desc')
+      .orderBy('name', 'asc');
+    
+    res.json(categories);
+  } catch (error) {
+    console.error('Error fetching event categories:', error);
+    res.status(500).json({ error: 'Failed to fetch categories' });
+  }
+});
+
+// Create a new category
+router.post('/', adminAuth, [
+  body('name').notEmpty().withMessage('Category name is required'),
+  body('slug').optional(),
+  body('is_global').optional().isBoolean(),
+  body('event_id').optional().isInt()
+], async (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const { name, slug, is_global = true, event_id = null } = req.body;
+    
+    // Generate slug if not provided
+    const categorySlug = slug || name.toLowerCase()
+      .replace(/[^\w\s-]/g, '')
+      .replace(/\s+/g, '-')
+      .replace(/-+/g, '-')
+      .trim();
+    
+    // Check if slug already exists for this scope
+    const existing = await db('photo_categories')
+      .where('slug', categorySlug)
+      .where(function() {
+        if (is_global) {
+          this.where('is_global', true);
+        } else {
+          this.where('event_id', event_id);
+        }
+      })
+      .first();
+    
+    if (existing) {
+      return res.status(400).json({ error: 'Category with this slug already exists' });
+    }
+    
+    // Create category
+    const [categoryId] = await db('photo_categories').insert({
+      name,
+      slug: categorySlug,
+      is_global,
+      event_id: is_global ? null : event_id
+    });
+    
+    const category = await db('photo_categories').where('id', categoryId).first();
+    
+    // Log activity
+    await logActivity('category_created', 
+      { categoryName: name, isGlobal: is_global },
+      event_id,
+      { type: 'admin', id: req.admin.id, name: req.admin.username }
+    );
+    
+    res.json(category);
+  } catch (error) {
+    console.error('Error creating category:', error);
+    res.status(500).json({ error: 'Failed to create category' });
+  }
+});
+
+// Update a category
+router.put('/:id', adminAuth, [
+  body('name').notEmpty().withMessage('Category name is required')
+], async (req, res) => {
+  try {
+    const errors = validationResult(req);
+    if (!errors.isEmpty()) {
+      return res.status(400).json({ errors: errors.array() });
+    }
+    
+    const { id } = req.params;
+    const { name } = req.body;
+    
+    const category = await db('photo_categories').where('id', id).first();
+    if (!category) {
+      return res.status(404).json({ error: 'Category not found' });
+    }
+    
+    await db('photo_categories')
+      .where('id', id)
+      .update({
+        name,
+        slug: name.toLowerCase()
+          .replace(/[^\w\s-]/g, '')
+          .replace(/\s+/g, '-')
+          .replace(/-+/g, '-')
+          .trim()
+      });
+    
+    const updated = await db('photo_categories').where('id', id).first();
+    
+    // Log activity
+    await logActivity('category_updated',
+      { categoryName: name },
+      category.event_id,
+      { type: 'admin', id: req.admin.id, name: req.admin.username }
+    );
+    
+    res.json(updated);
+  } catch (error) {
+    console.error('Error updating category:', error);
+    res.status(500).json({ error: 'Failed to update category' });
+  }
+});
+
+// Delete a category
+router.delete('/:id', adminAuth, async (req, res) => {
+  try {
+    const { id } = req.params;
+    
+    const category = await db('photo_categories').where('id', id).first();
+    if (!category) {
+      return res.status(404).json({ error: 'Category not found' });
+    }
+    
+    // Check if category has photos
+    const photoCount = await db('photos').where('category_id', id).count('id as count').first();
+    if (photoCount.count > 0) {
+      return res.status(400).json({ 
+        error: 'Cannot delete category with photos. Please reassign photos first.' 
+      });
+    }
+    
+    await db('photo_categories').where('id', id).delete();
+    
+    // Log activity
+    await logActivity('category_deleted',
+      { categoryName: category.name },
+      category.event_id,
+      { type: 'admin', id: req.admin.id, name: req.admin.username }
+    );
+    
+    res.json({ message: 'Category deleted successfully' });
+  } catch (error) {
+    console.error('Error deleting category:', error);
+    res.status(500).json({ error: 'Failed to delete category' });
+  }
+});
+
+module.exports = router;