feat: DeepSeek v4 模型对齐、作业助手脚本与 Agent 对比测试

- 前端 WorkflowEditor/ModelConfigs/NodeTemplates：deepseek-v4-flash、v4-pro，弃用提示
- llm_service 默认 deepseek-v4-flash；workflow_engine 等与模型配置注入
- 作业管理脚本支持 AGENT_NAME 与 v4-pro；新增 compare_homework_agents 脚本
- 文档重命名为 (红头)项目核心文档汇总.md 并更新 DeepSeek 说明

Made-with: Cursor

frontend/src/views/ModelConfigs.vue

@@ -108,7 +108,21 @@
           </el-select>
         </el-form-item>
         <el-form-item label="模型名称" prop="model_name">
-          <el-input v-model="form.model_name" placeholder="例如: gpt-3.5-turbo, deepseek-chat" />
+          <el-select
+            v-model="form.model_name"
+            placeholder="选择或输入模型名称"
+            filterable
+            allow-create
+            default-first-option
+            style="width: 100%"
+          >
+            <el-option
+              v-for="name in providerModelOptions"
+              :key="name"
+              :label="name"
+              :value="name"
+            />
+          </el-select>
         </el-form-item>
         <el-form-item label="API密钥" prop="api_key">
           <el-input
@@ -164,7 +178,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, onMounted, computed } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import MainLayout from '@/components/MainLayout.vue'
 import {
@@ -207,6 +221,20 @@ const testing = ref(false)
 const testResult = ref<any>(null)
 const currentTestConfig = ref<ModelConfig | null>(null)
 
+const providerModelOptions = computed(() => {
+  const provider = form.value.provider
+  if (provider === 'openai') {
+    return ['gpt-4o', 'gpt-4-turbo-preview', 'gpt-4', 'gpt-3.5-turbo']
+  }
+  if (provider === 'deepseek') {
+    return ['deepseek-v4-flash', 'deepseek-v4-pro', 'deepseek-chat', 'deepseek-reasoner', 'deepseek-coder']
+  }
+  if (provider === 'anthropic') {
+    return ['claude-3-5-sonnet-latest', 'claude-3-opus-20240229']
+  }
+  return []
+})
+
 // 表单验证规则
 const rules = {
   name: [