Phase 2 of the full modernization:
- App factory pattern with create_app()
- Settings via dataclass with env vars
- Dependency injection container
- Router stubs for auth, storage, api, recipes, cache, runs
- Service layer stubs for run, recipe, cache
- Repository layer placeholder
Routes are stubs that import from legacy server.py during migration.
Next: Migrate each router fully with templates.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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