fix: 全站页面保活机制、登录拦截优化、UI修复与功能完善

- 移除未登录全页面拦截，改为浏览自由 + 功能使用时弹窗
- 修复PageTransition退出动画卡死导致黑屏的bug
- CanvasPage添加加载中状态避免首次访问黑屏假死
- 全站7个工具页添加页面保活机制，切页后台任务不中断
- 修复未登录时401误触发"用户已在别处登录"弹窗
- 删除MorePage模板板块、微信登录、EcommerceTemplates/SizeTemplate路由
- 剧本评分接入DashScope qwen3.7-max直连API
- 电商视频生成重构为3阶段可视管线（策划→生成图片→生成视频）
- 电商视频保活增强：异步函数直接写localStorage避免卸载丢失
- Workbench侧边栏移除mode过滤，三模式共用同一对话列表
- 首页更新轮播图/背景视频、按钮跳转修正、文案优化
- AppShell顶栏新增网站备案信息按钮
- 多个页面的terminate/cancel按钮覆盖、单镜头重试、批量保存下载

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

src/api/scriptEvalClient.ts

@@ -1,5 +1,3 @@
-import { buildApiUrl, buildAuthHeaders } from "./serverConnection";
-
 export interface ScriptEvalResult {
   totalScore: number;
   grade: string;
@@ -10,6 +8,10 @@ export interface ScriptEvalResult {
   suggestions: string[];
 }
 
+const DASHSCOPE_API_KEY = import.meta.env.VITE_DASHSCOPE_API_KEY || "";
+const DASHSCOPE_ENDPOINT = "/dashscope-api/chat/completions";
+const MODEL = "qwen3.7-max";
+
 const EVAL_SYSTEM_PROMPT = `你是一位资深影视剧本评审专家，拥有二十年以上的编剧、制片和剧本医生经验。你精通各类影视叙事理论（三幕式、英雄之旅、起承转合、序列法），同时深度跟踪AIGC短剧/漫剧行业最新趋势。你的任务是对用户提供的剧本进行严谨、系统、多维度的量化评分。
 
 【剧本类型识别】
@@ -67,31 +69,35 @@ function extractJson(text: string): unknown {
 }
 
 export async function evaluateScript(script: string, signal?: AbortSignal): Promise<ScriptEvalResult> {
-  console.log("[API] 发送评测请求，剧本长度:", script.slice(0, 8000).length, "字符");
-  const res = await fetch(buildApiUrl("ai/chat"), {
+  if (!DASHSCOPE_API_KEY) {
+    throw new Error("DashScope API key 未配置，请在 .env.local 中设置 VITE_DASHSCOPE_API_KEY");
+  }
+
+  const res = await fetch(DASHSCOPE_ENDPOINT, {
     method: "POST",
-    headers: buildAuthHeaders(),
+    headers: {
+      "Content-Type": "application/json",
+      Authorization: `Bearer ${DASHSCOPE_API_KEY}`,
+    },
     body: JSON.stringify({
-      model: "qwen3.7-max",
+      model: MODEL,
       messages: [
         { role: "system", content: EVAL_SYSTEM_PROMPT },
         { role: "user", content: `请评测以下剧本：\n\n${script.slice(0, 8000)}` },
       ],
       stream: false,
       temperature: 0.3,
+      max_tokens: 4096,
     }),
     signal,
   });
 
-  console.log("[API] 响应状态:", res.status, res.statusText);
-
   if (!res.ok) {
-    throw new Error(`评测请求失败 (${res.status})`);
+    const errText = await res.text().catch(() => "");
+    throw new Error(`评测请求失败 (${res.status}): ${errText.slice(0, 200)}`);
   }
 
   const payload = await res.json();
-  console.log("[API] 原始响应体:", payload);
-
   const content: string = payload?.choices?.[0]?.message?.content
     ?? payload?.result?.content
     ?? payload?.content
@@ -100,11 +106,7 @@ export async function evaluateScript(script: string, signal?: AbortSignal): Prom
 
   if (!content) throw new Error("模型未返回有效内容");
 
-  console.log("[API] 模型返回内容 (前500字符):", content.slice(0, 500));
-
   const parsed = extractJson(content) as Record<string, unknown>;
-  console.log("[API] 解析后的JSON:", parsed);
-
   const dimensionScores: Record<string, number> = {};
   const rawScores = parsed.dimensionScores as Record<string, number> | undefined;
   if (!rawScores || typeof rawScores !== "object") throw new Error("评分格式异常");
@@ -115,7 +117,6 @@ export async function evaluateScript(script: string, signal?: AbortSignal): Prom
   }
 
   const { totalScore, grade } = computeTotalAndGrade(dimensionScores);
-  console.log("[API] 计算后总分:", totalScore, "等级:", grade);
 
   return {
     totalScore,