- Replace 6847-line monolithic server.py with 26-line entry point
- All routes now in app/routers/ using Jinja2 templates
- Add plan_node.html template for step details
- Add plan node route to runs router with cache_id lookup
- Backup old server as server_legacy.py
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
