修复 Windows 编码问题导致生成失败

Windows 默认编码为 GBK，Python stdout 输出含中文的 JSON 时
Node.js 端无法正确解析，导致批量生成操作静默失败。

- python/main.py：启动时强制 stdin/stdout 使用 UTF-8
- templateIpc.js：spawn 传入 PYTHONUTF8=1，改用 Buffer 拼接后 UTF-8 解码

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

electron/ipc/templateIpc.js

@@ -18,16 +18,19 @@ const PYTHON_BIN = app.isPackaged
 function callPython(payload) {
   return new Promise((resolve, reject) => {
     const isPackaged = app.isPackaged;
+    // PYTHONUTF8=1 确保 Windows 上 Python 使用 UTF-8 编码
+    const spawnEnv = { ...process.env, PYTHONUTF8: "1" };
     const proc = isPackaged
-      ? spawn(PYTHON_BIN)
-      : spawn(process.env.PYTHON_PATH || "python3", [PYTHON_BIN]);
+      ? spawn(PYTHON_BIN, [], { env: spawnEnv })
+      : spawn(process.env.PYTHON_PATH || "python3", [PYTHON_BIN], { env: spawnEnv });
 
-    let stdout = "";
-    proc.stdout.on("data", (d) => (stdout += d));
-    proc.stderr.on("data", (d) => console.error("[python]", d.toString()));
+    const chunks = [];
+    proc.stdout.on("data", (d) => chunks.push(d));
+    proc.stderr.on("data", (d) => console.error("[python]", d.toString("utf8")));
     proc.on("close", () => {
+      const stdout = Buffer.concat(chunks).toString("utf8").trim();
       try {
-        resolve(JSON.parse(stdout.trim()));
+        resolve(JSON.parse(stdout));
       } catch (e) {
         reject(new Error("Python 返回了无效 JSON: " + stdout));
       }

python/main.py

@@ -1,5 +1,10 @@
 import sys
 import json
+import io
+
+# Windows 默认编码不是 UTF-8，强制设置
+sys.stdin = io.TextIOWrapper(sys.stdin.buffer, encoding="utf-8")
+sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding="utf-8", line_buffering=True)
 
 def main():
     for line in sys.stdin: