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>

app/actions/bazi.ts

@@ -0,0 +1,30 @@
+"use server";
+
+import { streamAIResponse } from "@/lib/ai/stream";
+import {
+  calculateBazi,
+  formatBaziForPrompt,
+  type BaziInput,
+} from "@/lib/calc/bazi";
+import { BAZI_SYSTEM_PROMPT } from "@/lib/prompts";
+
+export async function getBaziAnswer(
+  input: BaziInput,
+  question: string,
+  birthPlaceName: string,
+) {
+  const chart = calculateBazi(input);
+  const chartText = formatBaziForPrompt(chart);
+
+  return streamAIResponse(
+    BAZI_SYSTEM_PROMPT,
+    `【出生时空】
+出生地：${birthPlaceName}
+
+【排盘信息】
+${chartText}
+
+【问事】
+${question}`,
+  );
+}