feat: add photo cap per event and Portuguese (pt-BR) locale

- Add photo_cap column to events table (migration 074) to limit photos per event
- Enforce photo cap in upload route, returning 400 when limit exceeded
- Pass photo_cap through all event CRUD routes and frontend forms
- Add complete Portuguese (pt-BR) translation (2300+ strings)
- Register pt locale in i18n config, language selector, date formatting
- Add photoCap/photoCapHelp translation keys to all locale files (en, de, ru, pt)

frontend/src/pages/admin/CreateEventPage.tsx

@@ -8,7 +8,8 @@ import {
   ArrowLeft,
   Palette,
   Eye,
-  EyeOff
+  EyeOff,
+  Image
 } from 'lucide-react';
 import { addDays } from 'date-fns';
 import { toast } from 'react-toastify';
@@ -44,6 +45,7 @@ interface FormData {
   allow_user_uploads: boolean;
   upload_category_id: number | null;
   css_template_id: number | null;
+  photo_cap: number;
   feedback_settings: {
     feedback_enabled: boolean;
     allow_ratings: boolean;
@@ -98,6 +100,7 @@ export const CreateEventPage: React.FC = () => {
     allow_user_uploads: false,
     upload_category_id: null,
     css_template_id: null,
+    photo_cap: 0,
     feedback_settings: {
       feedback_enabled: false,
       allow_ratings: true,
@@ -298,6 +301,7 @@ export const CreateEventPage: React.FC = () => {
       allow_user_uploads: formData.allow_user_uploads,
       upload_category_id: formData.upload_category_id,
       css_template_id: formData.css_template_id,
+      photo_cap: formData.photo_cap > 0 ? formData.photo_cap : null,
       feedback_enabled: feedbackSettings.feedback_enabled,
       allow_ratings: feedbackSettings.allow_ratings,
       allow_likes: feedbackSettings.allow_likes,
@@ -717,6 +721,27 @@ export const CreateEventPage: React.FC = () => {
               </div>
             )}
 
+            {/* Photo Cap */}
+            <div className="pt-4 border-t border-neutral-200 dark:border-neutral-700">
+              <label className="block text-sm font-medium text-neutral-700 dark:text-neutral-300 mb-2">
+                {t('events.photoCap', 'Photo Limit')}
+              </label>
+              <div className="flex items-center gap-2">
+                <div className="w-32">
+                  <Input
+                    type="number"
+                    value={formData.photo_cap}
+                    onChange={(e) => setFormData({ ...formData, photo_cap: parseInt(e.target.value) || 0 })}
+                    min={0}
+                    leftIcon={<Image className="w-5 h-5" />}
+                  />
+                </div>
+                <span className="text-sm text-neutral-600 dark:text-neutral-400">
+                  {t('events.photoCapHelp', 'Maximum number of photos allowed. 0 = unlimited')}
+                </span>
+              </div>
+            </div>
+
             {/* User Upload Settings */}
             <div className="pt-4 border-t border-neutral-200 dark:border-neutral-700">
               <label className="flex items-center gap-3">

frontend/src/pages/admin/EventDetailsPage.tsx

@@ -172,6 +172,8 @@ export const EventDetailsPage: React.FC = () => {
     hero_logo_position: 'top' | 'center' | 'bottom';
     // Hero image anchor position (#162) – keyword or "X% Y%" focal point
     hero_image_anchor: string;
+    // Photo cap
+    photo_cap: number;
   };
 
   const [isEditing, setIsEditing] = useState(false);
@@ -202,6 +204,8 @@ export const EventDetailsPage: React.FC = () => {
     hero_logo_position: 'top',
     // Hero image anchor position (#162)
     hero_image_anchor: 'center',
+    // Photo cap
+    photo_cap: 0,
   });
   const [feedbackSettings, setFeedbackSettings] = useState<FeedbackSettingsType>({
     feedback_enabled: false,
@@ -417,6 +421,8 @@ export const EventDetailsPage: React.FC = () => {
       hero_logo_position: event.hero_logo_position || 'top',
       // Hero image anchor position (#162)
       hero_image_anchor: event.hero_image_anchor || 'center',
+      // Photo cap
+      photo_cap: event.photo_cap || 0,
     });
 
     setShowNewPassword(false);
@@ -550,6 +556,8 @@ export const EventDetailsPage: React.FC = () => {
       hero_logo_position: editForm.hero_logo_position,
       // Hero image anchor position (#162)
       hero_image_anchor: editForm.hero_image_anchor,
+      // Photo cap
+      photo_cap: editForm.photo_cap > 0 ? editForm.photo_cap : null,
       // Header style settings (decoupled from layout, #158)
       header_style: currentTheme?.headerStyle || 'standard',
       hero_divider_style: currentTheme?.heroDividerStyle || 'wave',
@@ -1026,6 +1034,25 @@ export const EventDetailsPage: React.FC = () => {
                   </div>
                 )}
                 
+                {/* Photo Cap */}
+                <div>
+                  <label className="block text-sm font-medium text-neutral-700 dark:text-neutral-300 mb-1">
+                    {t('events.photoCap', 'Photo Limit')}
+                  </label>
+                  <div className="flex items-center gap-2">
+                    <input
+                      type="number"
+                      value={editForm.photo_cap}
+                      onChange={(e) => setEditForm(prev => ({ ...prev, photo_cap: parseInt(e.target.value) || 0 }))}
+                      min={0}
+                      className="w-24 px-3 py-2 border border-neutral-300 dark:border-neutral-600 bg-white dark:bg-neutral-800 text-neutral-900 dark:text-neutral-100 rounded-lg focus:ring-2 focus:ring-primary-500 focus:border-primary-500"
+                    />
+                    <span className="text-xs text-neutral-500 dark:text-neutral-400">
+                      {t('events.photoCapHelp', 'Maximum number of photos allowed. 0 = unlimited')}
+                    </span>
+                  </div>
+                </div>
+
                 <div>
                   <label className="flex items-center">
                     <input