added：增加Linux-server

write-server/src/lib/ai.ts

@@ -0,0 +1,69 @@
+const DEEPSEEK_BASE = process.env.DEEPSEEK_BASE_URL || "https://api.deepseek.com";
+const DEEPSEEK_KEY = process.env.DEEPSEEK_API_KEY || "";
+const DEEPSEEK_MODEL = process.env.DEEPSEEK_MODEL || "deepseek-chat";
+const DEEPSEEK_ANTHROPIC = process.env.DEEPSEEK_ANTHROPIC === "true";
+
+export async function aiChat(
+  systemPrompt: string,
+  userMessage: string
+): Promise<string> {
+  if (!DEEPSEEK_KEY) throw new Error("DeepSeek API key not configured");
+
+  let url: string;
+  let headers: Record<string, string>;
+  let body: Record<string, unknown>;
+
+  if (DEEPSEEK_ANTHROPIC) {
+    // Anthropic Messages API
+    url = `${DEEPSEEK_BASE}/v1/messages`;
+    headers = {
+      "Content-Type": "application/json",
+      "x-api-key": DEEPSEEK_KEY,
+      "anthropic-version": "2023-06-01",
+    };
+    body = {
+      model: DEEPSEEK_MODEL,
+      max_tokens: 2048,
+      system: systemPrompt,
+      messages: [{ role: "user", content: userMessage }],
+    };
+  } else {
+    // OpenAI-compatible API (default)
+    url = `${DEEPSEEK_BASE}/v1/chat/completions`;
+    headers = {
+      "Content-Type": "application/json",
+      Authorization: `Bearer ${DEEPSEEK_KEY}`,
+    };
+    body = {
+      model: DEEPSEEK_MODEL,
+      temperature: 0.7,
+      max_tokens: 2048,
+      messages: [
+        { role: "system", content: systemPrompt },
+        { role: "user", content: userMessage },
+      ],
+    };
+  }
+
+  const res = await fetch(url, { method: "POST", headers, body: JSON.stringify(body) });
+
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({}));
+    throw new Error((err as { error?: { message?: string } }).error?.message || `API error: ${res.status}`);
+  }
+
+  const data = await res.json();
+  // Anthropic format or OpenAI format
+  const text = data?.content?.[0]?.text || data?.choices?.[0]?.message?.content || "";
+  if (!text) throw new Error("AI returned empty response");
+  return text;
+}
+
+export const AI_PROMPTS = {
+  polish: "你是一个文字润色助手。请润色以下文字，使其更流畅、更有文采，但保持原意和语气不变。直接返回润色后的文字，不要加任何解释。",
+  expand: "你是一个写作助手。请扩写以下文字，增加更多细节和论述，使其更充实。保持原风格和语气。直接返回扩写后的文字，不要加任何解释。",
+  shorten: "你是一个写作助手。请缩写以下文字，保留核心信息，删除冗余。直接返回缩写后的文字，不要加任何解释。",
+  fix: "你是一个文字校对助手。请修正以下文字中的错别字、语法错误和标点问题。直接返回修正后的文字，不要加任何解释。",
+  summary: "根据以下文章标题和内容，生成一个简短的摘要（100字以内）。直接返回摘要，不要加任何解释。\n\n标题：{title}\n\n内容片段：{content}",
+  tags: "根据以下文章标题和内容，提取3-5个中文标签（用顿号分隔）。只返回标签，不要加解释。\n\n标题：{title}\n\n内容片段：{content}",
+};