chore: update environment config for CDN

- Add CDN_BASE_URL for direct image access
- Rename DEFAULT_ORG_ID → DEFAULT_ORG_SLUG
- Rename DEFAULT_PROJECT_ID → DEFAULT_PROJECT_SLUG

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

infrastructure/.env.example

@@ -31,13 +31,9 @@ MINIO_BUCKET_NAME=banatie
 MINIO_USE_SSL=false
 STORAGE_TYPE=minio
 
-# Public URL for CDN access (used in API responses)
-MINIO_PUBLIC_URL=https://cdn.banatie.app
-
-# Use direct CDN URLs instead of API proxy (recommended for production)
-# Set to 'false' to force API URLs even when MINIO_PUBLIC_URL is configured
-# Default: true (CDN enabled when MINIO_PUBLIC_URL is present)
-USE_DIRECT_CDN=true
+# CDN Base URL for image access
+# Format: https://cdn.banatie.app/{orgSlug}/{projectSlug}/img/{imageId}
+CDN_BASE_URL=https://cdn.banatie.app
 
 # ----------------------------------------
 # API Configuration
@@ -57,6 +53,6 @@ CORS_ORIGIN=https://banatie.app,https://api.banatie.app
 # ----------------------------------------
 # Multi-tenancy Defaults
 # ----------------------------------------
-DEFAULT_ORG_ID=default
-DEFAULT_PROJECT_ID=main
+DEFAULT_ORG_SLUG=default
+DEFAULT_PROJECT_SLUG=main
 DEFAULT_USER_ID=system