fix: auto-fetch Dify models using existing API keys as fallback

- Backend: try DIFY_CHAT/WORKFLOW_API_KEY when workspace key is missing
- Frontend: always show '从 Dify 获取' button, not just after first fetch

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

api/insurance/admin/ppt_admin_service.py

@@ -500,31 +500,48 @@ class PptAdminService:
         """调用 Dify API 获取可用 LLM 模型列表，失败返回 None。"""
         import requests
         try:
-            # 从 SystemSetting 读取 Dify Workspace API Key
-            key_setting = SystemSetting.query.filter_by(key="dify_workspace_api_key").first()
-            api_key = key_setting.value if key_setting and key_setting.value else ""
-            if not api_key:
-                return None
-
             base_url = os.getenv("DIFY_BASE_URL", "http://localhost:5001")
-            resp = requests.get(
-                f"{base_url}/v1/workspaces/current/models/model-types/llm",
-                headers={"Authorization": f"Bearer {api_key}"},
-                timeout=10,
-            )
-            if resp.status_code != 200:
-                logger.warning(f"Dify 模型查询失败: HTTP {resp.status_code}")
-                return None
 
-            data = resp.json()
-            models = []
-            for item in data.get("data", []):
-                provider = item.get("provider", "")
-                for model in item.get("models", []):
-                    model_name = model.get("model", "")
-                    label = model.get("label", {}).get("zh_Hans", "") or model.get("label", {}).get("en_US", "") or model_name
-                    models.append({"provider": provider, "model": model_name, "label": label})
-            return models if models else None
+            # 收集可用的 API Key，按优先级尝试
+            candidate_keys: list[str] = []
+            key_setting = SystemSetting.query.filter_by(key="dify_workspace_api_key").first()
+            if key_setting and key_setting.value:
+                candidate_keys.append(key_setting.value)
+            for env_key in ("DIFY_CHAT_APP_API_KEY", "DIFY_WORKFLOW_APP_API_KEY",
+                            "BAODAN_CHAT_API_KEY", "BAODAN_WORKFLOW_API_KEY"):
+                val = os.getenv(env_key, "").strip()
+                if val:
+                    candidate_keys.append(val)
+            # 去重保持顺序
+            seen = set()
+            api_keys = []
+            for k in candidate_keys:
+                if k not in seen:
+                    seen.add(k)
+                    api_keys.append(k)
+
+            for api_key in api_keys:
+                try:
+                    resp = requests.get(
+                        f"{base_url}/v1/workspaces/current/models/model-types/llm",
+                        headers={"Authorization": f"Bearer {api_key}"},
+                        timeout=10,
+                    )
+                    if resp.status_code != 200:
+                        continue
+                    data = resp.json()
+                    models = []
+                    for item in data.get("data", []):
+                        provider = item.get("provider", "")
+                        for model in item.get("models", []):
+                            model_name = model.get("model", "")
+                            label = model.get("label", {}).get("zh_Hans", "") or model.get("label", {}).get("en_US", "") or model_name
+                            models.append({"provider": provider, "model": model_name, "label": label})
+                    if models:
+                        return models
+                except Exception:
+                    continue
+            return None
         except Exception as e:
             logger.warning(f"从 Dify 获取模型列表失败: {e}")
             return None

frontend/src/pages/admin/PptSettingsAdmin.vue

@@ -21,7 +21,8 @@
       <el-form-item label="模型名称">
         <div style="display: flex; gap: 8px; width: 100%">
           <el-input v-model="form.ppt_llm_model" placeholder="如 deepseek-chat" />
-          <el-dropdown v-if="difyModels.length" trigger="click" @command="(cmd: string) => applyDifyModel('ppt', cmd)">
+          <el-button v-if="!difyModels.length" @click="fetchDifyModels" :loading="fetchingModels">从 Dify 获取</el-button>
+          <el-dropdown v-else trigger="click" @command="(cmd: string) => applyDifyModel('ppt', cmd)">
             <el-button>从 Dify 获取 <el-icon><ArrowDown /></el-icon></el-button>
             <template #dropdown>
               <el-dropdown-menu>
@@ -32,7 +33,6 @@
               </el-dropdown-menu>
             </template>
           </el-dropdown>
-          <el-button v-else @click="fetchDifyModels" :loading="fetchingModels">从 Dify 获取</el-button>
         </div>
       </el-form-item>
 
@@ -60,7 +60,8 @@
       <el-form-item label="模型名称">
         <div style="display: flex; gap: 8px; width: 100%">
           <el-input v-model="form.poster_llm_model" placeholder="如 deepseek-chat" />
-          <el-dropdown v-if="difyModels.length" trigger="click" @command="(cmd: string) => applyDifyModel('poster', cmd)">
+          <el-button v-if="!difyModels.length" @click="fetchDifyModels" :loading="fetchingModels">从 Dify 获取</el-button>
+          <el-dropdown v-else trigger="click" @command="(cmd: string) => applyDifyModel('poster', cmd)">
             <el-button>从 Dify 获取 <el-icon><ArrowDown /></el-icon></el-button>
             <template #dropdown>
               <el-dropdown-menu>