Refactor: modular architecture — extract composables & components
- Extract useDragDrop.js (drag/drop, block move, resize)
- Extract useSelection.js (lasso, multi-select, hover linking)
- Extract WeekCalendar.vue, MonthCalendar.vue, RightPanel.vue
- DispatchV2Page.vue: 3018 → 1438 lines (orchestration only)
- Remove <style scoped> — styles cascade to child components
- Add .dockerignore (build context 214MB → 112KB)
- Add infra/ with docker-compose reference and .env.example
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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