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>

components/shared/datetime-picker.tsx

@@ -0,0 +1,49 @@
+"use client";
+
+interface DateTimePickerProps {
+  date: string;
+  time: string;
+  onDateChange: (date: string) => void;
+  onTimeChange: (time: string) => void;
+  label?: string;
+  timeDisabled?: boolean;
+}
+
+export function nowDateString() {
+  return new Date().toISOString().slice(0, 10);
+}
+
+export function nowTimeString() {
+  const d = new Date();
+  return `${d.getHours().toString().padStart(2, "0")}:${d.getMinutes().toString().padStart(2, "0")}`;
+}
+
+export default function DateTimePicker({
+  date,
+  time,
+  onDateChange,
+  onTimeChange,
+  label = "时间",
+  timeDisabled = false,
+}: DateTimePickerProps) {
+  return (
+    <div className="space-y-2">
+      <label className="text-sm font-medium">{label}</label>
+      <div className="grid gap-2 sm:grid-cols-2">
+        <input
+          type="date"
+          className="rounded-md border bg-background px-3 py-2 text-sm disabled:opacity-50"
+          value={date}
+          onChange={(e) => onDateChange(e.target.value)}
+        />
+        <input
+          type="time"
+          className="rounded-md border bg-background px-3 py-2 text-sm disabled:opacity-50"
+          value={time}
+          disabled={timeDisabled}
+          onChange={(e) => onTimeChange(e.target.value)}
+        />
+      </div>
+    </div>
+  );
+}