Make credential file writing optional in migration

- Wrapped file writing in try-catch to prevent migration failure
- Credentials are always shown in console output
- File writing is now optional - if it fails, migration continues
- Added informative message when file cannot be written

This prevents the migration from failing in environments where
the data directory has permission issues, while still ensuring
administrators can see and copy the credentials from console output.

backend/migrations/core/001_init.js

@@ -25,16 +25,10 @@ exports.up = async function(knex) {
         created_at: new Date()
       });
       
-      // Save the generated password to a file for the user to retrieve
+      // Try to save credentials to file, but don't fail if we can't
       const dataDir = path.join(__dirname, '..', '..', 'data');
       const setupInfoPath = path.join(dataDir, 'ADMIN_CREDENTIALS.txt');
       
-      // Ensure data directory exists
-      try {
-        await fs.mkdir(dataDir, { recursive: true });
-      } catch (error) {
-        // Directory might already exist, that's okay
-      }
       const setupInfo = `
 ========================================
 PicPeak Admin Credentials
@@ -57,7 +51,16 @@ Generated on: ${new Date().toISOString()}
 ========================================
 `;
       
-      await fs.writeFile(setupInfoPath, setupInfo, 'utf8');
+      try {
+        // Try to create directory and write file
+        await fs.mkdir(dataDir, { recursive: true });
+        await fs.writeFile(setupInfoPath, setupInfo, 'utf8');
+        console.log(`📁 Credentials also saved to: data/ADMIN_CREDENTIALS.txt`);
+      } catch (error) {
+        // If we can't write the file, that's okay - credentials are shown in console
+        console.log('⚠️  Could not save credentials to file (permission denied)');
+        console.log('   Please copy the credentials shown above');
+      }
       
       console.log('\n========================================');
       console.log('✅ Admin user created successfully!');
@@ -67,7 +70,6 @@ Generated on: ${new Date().toISOString()}
       console.log('\n⚠️  IMPORTANT:');
       console.log('1. Save these credentials securely');
       console.log('2. Please change the password after first login');
-      console.log('3. Credentials are also saved in: data/ADMIN_CREDENTIALS.txt');
       console.log('========================================\n');
     }