Fix API connectivity and import filament data from PDF

- Update all environment files to use new PostgreSQL API endpoint
- Fix CORS configuration in API server
- Import 35 filaments and 29 colors from PDF data
- Fix TypeScript type error in dashboard
- Add back emoji icons for dark mode toggle
- Remove debugging code and test buttons
- Clean up error handling

.env.production

@@ -2,10 +2,8 @@
 NODE_ENV=production
 
 # API Configuration
-NEXT_PUBLIC_API_URL=https://5wmfjjzm0i.execute-api.eu-central-1.amazonaws.com/production
+NEXT_PUBLIC_API_URL=https://api.filamenteka.rs/api
 
-# AWS Configuration
-AWS_REGION=eu-central-1
-DYNAMODB_TABLE_NAME=filamenteka-filaments
-
-# Admin credentials are stored in AWS Secrets Manager in production
+# AWS Configuration (for reference - no longer used)
+# AWS_REGION=eu-central-1
+# DYNAMODB_TABLE_NAME=filamenteka-filaments