Initial scaffold: docs, data manifest, and static dashboard

docs/migration-plan.md

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+# Migration Plan
+
+## Phase 1 — Intake & Inventory
+- [ ] Collect CSV/DAX exports and source report screenshots
+- [ ] Document data model + relationships
+- [ ] Identify all KPIs and filters
+
+## Phase 2 — KPI Definition
+- [ ] Translate each DAX measure into deterministic formulas
+- [ ] Validate calculations against source data
+
+## Phase 3 — Backend Logic (Local)
+- [ ] Implement KPI calculations in JS (no database yet)
+- [ ] Build reusable aggregation utilities
+
+## Phase 4 — UI Buildout
+- [ ] Recreate filters, charts, and tables
+- [ ] Match layout/visual hierarchy
+
+## Phase 5 — Validation
+- [ ] Compare KPI outputs to Power BI values
+- [ ] Iterate until exact match