feat: migrate from npm to bun and fix analytics map height

Switch package manager and runtime from Node.js/npm to Bun across
Docker, CI, and scripts. The SQLite driver remains better-sqlite3
due to Next.js Turbopack being unable to resolve bun:sqlite during
build-time page pre-rendering.

Also fix the world map not rendering in the analytics page — the
overflowX wrapper added for mobile broke the flex height chain,
collapsing the map to 0px.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker/web/entrypoint.sh

@@ -8,4 +8,4 @@ echo "Ensuring database directory exists..."
 mkdir -p "$DB_DIR"
 
 echo "Starting application..."
-exec env HOSTNAME=0.0.0.0 node server.js
+exec env HOSTNAME=0.0.0.0 bun server.js