refactor: remove Anki import/export and simplify card system

- Remove Anki apkg import/export functionality
- Remove OCR feature module
- Remove note and note-type modules
- Simplify card/deck modules (remove spaced repetition complexity)
- Update translator and dictionary features
- Clean up unused translations and update i18n files
- Simplify prisma schema

src/lib/bigmodel/llm.ts

@@ -1,12 +1,5 @@
 "use server";
 
-import OpenAI from "openai";
-
-const openai = new OpenAI({
-  apiKey: process.env.ZHIPU_API_KEY,
-  baseURL: "https://open.bigmodel.cn/api/paas/v4",
-});
-
 type Messages = Array<
   | { role: "system"; content: string }
   | { role: "user"; content: string }
@@ -20,13 +13,29 @@ async function getAnswer(prompt: string | Messages): Promise<string> {
     ? [{ role: "user", content: prompt }]
     : prompt;
 
-  const response = await openai.chat.completions.create({
-    model: process.env.ZHIPU_MODEL_NAME || "glm-4",
-    messages: messages as OpenAI.Chat.Completions.ChatCompletionMessageParam[],
-    temperature: 0.2,
+  const response = await fetch("https://open.bigmodel.cn/api/paas/v4/chat/completions", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+      "Authorization": `Bearer ${process.env.ZHIPU_API_KEY}`,
+    },
+    body: JSON.stringify({
+      model: process.env.ZHIPU_MODEL_NAME || "glm-4.6",
+      messages,
+      temperature: 0.2,
+      thinking: {
+        type: "disabled"
+      }
+    }),
   });
 
-  const content = response.choices[0]?.message?.content;
+  if (!response.ok) {
+    throw new Error(`AI API 请求失败: ${response.status}`);
+  }
+
+  const data = await response.json() as { choices?: Array<{ message?: { content?: string } }> };
+  const content = data.choices?.[0]?.message?.content;
+
   if (!content) {
     throw new Error("AI API 返回空响应");
   }