chore: add BACKLOG.md with planned features

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ianmaccallum

BACKLOG.md

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+# Backlog
+
+## Reusable Components
+- Component registry allowing HTML/SVG components to be shared across templates
+- Import system so templates can reference common elements (logos, badges, frames)
+
+## Asset Templates
+- `open-assets new <template>` command to scaffold new assets from predefined templates
+- Built-in templates for common asset types (App Store screenshot, icon, feature graphic)
+
+## Configurable Export Locations
+- Define export destinations per collection so rendered assets are automatically copied to target paths
+- Support mapping a single source to multiple output locations (e.g., app icon → Xcode, Android, web favicon)
+
+## Automations / Publishing
+- Render and publish to App Store Connect directly from the CLI
+- Render and publish to Google Play Console
+- Support for additional platforms: Product Hunt, Slack app directory, etc.
+
+## Android Asset Catalog
+- Android project output handler (analogous to the existing Xcode `.appiconset` integration)
+- Generates appropriate drawable/mipmap resources
+
+## Videos / Video Templates
+- Video asset support (e.g., App Store preview videos)
+- Video templates with configurable duration, transitions, and content