phase 1: scaffold D3/TopoJSON migration structure

- Extract country prison data to assets/data/countries.js (ES module)
- Add ISO numeric→alpha-3 lookup table for TopoJSON ID bridging
- Download world-atlas countries-110m.json (TopoJSON, 108KB)
- Create stub ES modules for map, charts, and UI layers
- Replace ZingChart/jQuery script tags with single ES module entry point
- Preserve original app.js as _app.js.bak for Phase 2+ reference

1 files changed, 2 insertions, 0 deletions

diff --git a/assets/js/charts/bar.js b/assets/js/charts/bar.js
new file mode 100644
index 0000000..4aa61ef
--- /dev/null
+++ b/assets/js/charts/bar.js
@@ -0,0 +1,2 @@
+// Phase 4: horizontal bar chart for top-N countries
+export function renderBarChart(container, data) {}