fix: resolve multiple production issues

- Fix archive page showing "00" instead of "0" for empty photo counts
- Fix email queue PostgreSQL "updated_at" column error with migration and fallback
- Fix storage calculation discrepancies between system status and archive pages
- Add proper storage info to system status endpoint
- Fix archive path concatenation in settings endpoint

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

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

backend/src/services/emailProcessor.js

@@ -369,13 +369,24 @@ async function processEmailQueue() {
         logger.info(`Email ${email.id} sent successfully`);
       } catch (error) {
         // Increment retry count
-        await db('email_queue')
-          .where('id', email.id)
-          .update({
-            retry_count: email.retry_count + 1,
-            error_message: error.message,
-            updated_at: new Date()
-          });
+        try {
+          await db('email_queue')
+            .where('id', email.id)
+            .update({
+              retry_count: email.retry_count + 1,
+              error_message: error.message
+            });
+        } catch (updateError) {
+          logger.error(`Failed to update email retry count for ${email.id}:`, updateError);
+          // If update fails due to column issue, try without any potential auto-added fields
+          if (updateError.message && updateError.message.includes('updated_at')) {
+            logger.warn('Detected updated_at column issue, attempting raw query...');
+            await db.raw(
+              'UPDATE email_queue SET retry_count = ?, error_message = ? WHERE id = ?',
+              [email.retry_count + 1, error.message, email.id]
+            );
+          }
+        }
           
         logger.error(`Failed to send email ${email.id}:`, error);
       }