fix: correct storage path resolution in multiple files (#96)

Fixed inconsistent storage path fallbacks that caused 500 errors when
serving thumbnails. The paths were using '../../storage' (2 levels up)
instead of '../../../storage' (3 levels up) when STORAGE_PATH env var
is not set.

Affected files:
- backend/src/routes/gallery.js
- backend/src/services/photoService.js
- backend/src/services/eventService.js

backend/src/routes/gallery.js

@@ -16,7 +16,7 @@ const { NotFoundError } = require('../utils/errors');
 const { ensureThumbnail } = require('../services/imageProcessor');
 
 // Get storage path from environment or default
-const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../storage');
+const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../../storage');
 
 // Check for slug redirect (for renamed events)
 async function checkSlugRedirect(slug) {

backend/src/services/eventService.js

@@ -15,7 +15,7 @@ const { validatePasswordInContext, getBcryptRounds } = require('../utils/passwor
 const { buildShareLinkVariants } = require('./shareLinkService');
 const { parseBooleanInput, parseStringInput } = require('../utils/parsers');
 
-const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../storage');
+const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../../storage');
 
 // Cache for schema detection
 let customerColumnCache = null;

backend/src/services/photoService.js

@@ -10,7 +10,7 @@ const fs = require('fs').promises;
 const { db } = require('../database/db');
 const { formatBoolean } = require('../utils/dbCompat');
 
-const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../storage');
+const getStoragePath = () => process.env.STORAGE_PATH || path.join(__dirname, '../../../storage');
 
 /**
  * Get photos for an event with optional filtering