Update state.json and development plan to reflect actual progress (~15%)
- state.json: Phase 5 status changed to pending, next steps updated - DEVELOPMENT_PLAN.md v1.1: Added actual progress, verified current state, renumbered phases 5-9, marked all remaining work as PENDING - Deleted outdated plans (BACKEND_TEST_PLAN, DATA_LOADING_VERIFICATION, DOCKER_MIGRATION_PLAN, ENDPOINT_AUDIT, ROADMAP, SIMPLIFICATION_PLAN, STATEMENT_OF_INTENT, backend/TEST_PLAN) - Added new files: DEVELOPMENT_PLAN.md, backend/ARCHITECTURAL_REPORT.md, backend/SIMPLIFICATION_SUMMARY.md, backend/run.py, backend/.dockerignore
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