Fix AI streaming, learn images, and full city regions.

Remove use server from stream helper to fix RSC errors; support OPENAI_API_BASE alias; render HTML tables via rehype-raw with gua-image API; expand regions to 356 prefecture-level cities.

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

lib/content/gua-utils.ts

@@ -41,11 +41,14 @@ export function extractChangeDetails(
     return changeList;
   }
 
-  guaChange
-    .split(":")[1]
-    .trim()
-    .split(",")
-    .forEach((change) => {
+  const changePart = guaChange.includes(":")
+    ? guaChange.split(":").slice(1).join(":").trim()
+    : guaChange.trim();
+  if (!changePart) {
+    return changeList;
+  }
+
+  changePart.split(",").forEach((change) => {
       const detail = guaDetail
         .match(`(\\*\\*${change}變卦[\\s\\S]*?)(?=${guaTitle}|$)`)?.[1]
         ?.replaceAll("\n\n", "\n");