Implement three divination modes, learn pages, and PM2 deploy on port 3130.

Add liuyao/bazi/combined flows with shared calc and AI infrastructure, 64-gua learn routes, and update Ubuntu PM2 deployment docs for port 3130.

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/data/regions.ts

@@ -0,0 +1,50 @@
+import regionsData from "@/lib/data/regions.json";
+
+export interface RegionNode {
+  name: string;
+  longitude: number;
+  children?: Record<string, RegionNode>;
+}
+
+export type RegionsData = Record<string, RegionNode>;
+
+export const regions = regionsData as RegionsData;
+
+export function getProvinces(): { code: string; name: string }[] {
+  return Object.entries(regions).map(([code, node]) => ({
+    code,
+    name: node.name,
+  }));
+}
+
+export function getCities(provinceCode: string): { code: string; name: string }[] {
+  const province = regions[provinceCode];
+  if (!province?.children) {
+    return [];
+  }
+  return Object.entries(province.children).map(([code, node]) => ({
+    code,
+    name: node.name,
+  }));
+}
+
+export function getRegionLocation(
+  provinceCode: string,
+  cityCode: string,
+): { name: string; longitude: number } | null {
+  const province = regions[provinceCode];
+  if (!province) {
+    return null;
+  }
+  const city = province.children?.[cityCode];
+  if (city) {
+    return {
+      name: `${province.name}${city.name}`,
+      longitude: city.longitude,
+    };
+  }
+  return {
+    name: province.name,
+    longitude: province.longitude,
+  };
+}