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/ai/stream.ts

@@ -1,27 +1,33 @@
-"use server";
-
 import { streamText } from "ai";
 import { createOpenAI } from "@ai-sdk/openai";
 import { createStreamableValue } from "ai/rsc";
 import { ERROR_PREFIX } from "@/lib/constant";
 
+function getOpenAiBaseUrl(): string {
+  return (
+    process.env.OPENAI_BASE_URL ??
+    process.env.OPENAI_API_BASE ??
+    "https://op.bz121.com/v1"
+  );
+}
+
 const model =
   process.env.OPENAI_MODEL ?? "huihui_ai/gemma-4-abliterated:e4b";
-const openai = createOpenAI({
-  baseURL: process.env.OPENAI_BASE_URL ?? "https://op.bz121.com/v1",
-});
-
-const STREAM_INTERVAL = 60;
-const MAX_SIZE = 6;
 
 export async function streamAIResponse(
   system: string,
   user: string,
 ): Promise<{ data?: ReturnType<typeof createStreamableValue<string>>["value"]; error?: string }> {
-  if (!process.env.OPENAI_API_KEY?.trim()) {
+  const apiKey = process.env.OPENAI_API_KEY?.trim();
+  if (!apiKey) {
     return { error: "未配置 OPENAI_API_KEY，请在 .env.local 或 Docker env_file 中设置" };
   }
 
+  const openai = createOpenAI({
+    apiKey,
+    baseURL: getOpenAiBaseUrl(),
+  });
+
   const stream = createStreamableValue<string>();
 
   try {
@@ -43,15 +49,15 @@ export async function streamAIResponse(
         stream.done();
         return;
       }
-      if (buffer.length <= MAX_SIZE) {
+      if (buffer.length <= 6) {
         stream.update(buffer);
         buffer = "";
       } else {
-        const chunk = buffer.slice(0, MAX_SIZE);
-        buffer = buffer.slice(MAX_SIZE);
+        const chunk = buffer.slice(0, 6);
+        buffer = buffer.slice(6);
         stream.update(chunk);
       }
-    }, STREAM_INTERVAL);
+    }, 60);
 
     (async () => {
       for await (const part of fullStream) {
@@ -67,7 +73,10 @@ export async function streamAIResponse(
         }
       }
     })()
-      .catch(console.error)
+      .catch((err) => {
+        const message = err instanceof Error ? err.message : String(err);
+        stream.update(ERROR_PREFIX + message);
+      })
       .finally(() => {
         done = true;
       });