Refactor the server

server-rs/src/state.rs

@@ -0,0 +1,12 @@
+use crate::data::{POIData, PropertyData};
+use crate::index::GridIndex;
+
+pub struct AppState {
+    pub data: PropertyData,
+    pub grid: GridIndex,
+    /// h3_cells[resolution][row_idx] = precomputed H3 cell ID.
+    /// Empty Vec for resolutions not precomputed.
+    pub h3_cells: Vec<Vec<u64>>,
+    pub poi_data: POIData,
+    pub poi_grid: GridIndex,
+}