feat: support configurable image generation models for poster creation

- Expand poster image model settings with provider, model name, API key,
  and base URL fields (was only model name + API key)
- Add presets for OpenAI (gpt-image-1), Doubao (火山引擎), and Zhipu (CogView)
- Refactor image_generator.py to read config from system_settings DB instead
  of hardcoding gpt-image-1 and OPENAI_API_KEY env var
- All OpenAI-compatible image APIs work via configurable base URL
- Add doubao and cogview to brand name mapping

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

api/insurance/admin/ppt_admin_service.py

@@ -507,8 +507,10 @@ class PptAdminService:
         "gemini": "Google",
         "qwen": "通义千问",
         "glm": "智谱",
+        "cogview": "智谱",
         "MiniMax": "MiniMax",
         "moonshot": "月之暗面",
+        "doubao": "豆包",
     }
 
     def _infer_brand(self, model_name: str) -> str:

api/insurance/poster/image_generator.py

@@ -1,4 +1,4 @@
-"""海报图片生成器 — 调用 GPT image API + Pillow 降级方案。"""
+"""海报图片生成器 — 支持多供应商生图模型（OpenAI / 豆包 / 智谱等）。"""
 import os
 import base64
 import logging
@@ -14,17 +14,43 @@ SIZE_MAP = {
 }
 
 
+def _load_image_config() -> dict:
+    """从数据库读取海报图片模型配置。"""
+    try:
+        from insurance.db.compat import db
+        from insurance.models.system_setting import SystemSetting
+        keys = ["poster_image_provider", "poster_image_model",
+                "poster_image_api_key", "poster_image_base_url"]
+        settings = {s.key: s.value for s in SystemSetting.query.filter(SystemSetting.key.in_(keys)).all()}
+        return settings
+    except Exception:
+        return {}
+
+
 class PosterImageGenerator:
-    """海报图片生成器，调用 GPT image 模型。"""
+    """海报图片生成器，支持 OpenAI 兼容接口的多供应商生图模型。"""
 
     def __init__(self):
-        self.client = None
+        self._client = None
+        self._config = None
+
+    def _get_config(self) -> dict:
+        if self._config is None:
+            self._config = _load_image_config()
+        return self._config
 
     def _get_client(self):
-        if self.client is None:
+        if self._client is None:
             import openai
-            self.client = openai.OpenAI(api_key=os.getenv("OPENAI_API_KEY"))
+            cfg = self._get_config()
-        return self.client
+            api_key = cfg.get("poster_image_api_key") or os.getenv("OPENAI_API_KEY", "")
+            base_url = cfg.get("poster_image_base_url") or os.getenv("OPENAI_BASE_URL", "https://api.openai.com/v1")
+            self._client = openai.OpenAI(api_key=api_key, base_url=base_url)
+        return self._client
+
+    def _get_model(self) -> str:
+        cfg = self._get_config()
+        return cfg.get("poster_image_model") or "gpt-image-1"
 
     def build_prompt(self, template: dict = None, product: dict = None,
                      company: dict = None, copy: dict = None, size: str = "1024x1792") -> str:
@@ -81,16 +107,17 @@ class PosterImageGenerator:
         return "\n".join(parts)
 
     def generate(self, prompt: str, size: str = "1024x1792", reference_image: str = None) -> bytes:
-        """调用 GPT image 模型生成海报图片。
+        """调用配置的生图模型生成海报图片。
 
         返回:
             PNG 图片的 bytes
         """
         api_size = SIZE_MAP.get(size, "1024x1792")
         client = self._get_client()
+        model = self._get_model()
 
         kwargs = {
-            "model": "gpt-image-1",
+            "model": model,
             "prompt": prompt,
             "n": 1,
             "size": api_size,
@@ -106,7 +133,7 @@ class PosterImageGenerator:
             try:
                 with open(reference_image, "rb") as img_file:
                     response = client.images.edit(
-                        model="gpt-image-1",
+                        model=model,
                         image=img_file,
                         prompt=prompt,
                         n=1,

frontend/src/pages/admin/PptSettingsAdmin.vue

@@ -86,12 +86,25 @@
       <!-- 海报图片模型 -->
       <el-divider content-position="left">海报图片模型</el-divider>
 
+      <el-form-item label="供应商">
+        <el-select v-model="form.poster_image_provider" placeholder="选择供应商" style="width: 100%" @change="onImageProviderChange">
+          <el-option label="OpenAI (gpt-image-1)" value="openai" />
+          <el-option label="豆包 (火山引擎)" value="doubao" />
+          <el-option label="智谱 (CogView)" value="zhipu" />
+          <el-option label="自定义" value="custom" />
+        </el-select>
+      </el-form-item>
+
       <el-form-item label="模型名称">
-        <el-input v-model="form.poster_image_model" placeholder="默认 gpt-image-1" />
+        <el-input v-model="form.poster_image_model" placeholder="如 gpt-image-1" />
       </el-form-item>
 
       <el-form-item label="API Key">
-        <el-input v-model="form.poster_image_api_key" type="password" show-password placeholder="留空则使用环境变量配置" />
+        <el-input v-model="form.poster_image_api_key" type="password" show-password placeholder="该供应商的 API Key" />
+      </el-form-item>
+
+      <el-form-item label="Base URL">
+        <el-input v-model="form.poster_image_base_url" placeholder="如 https://api.openai.com/v1" />
       </el-form-item>
 
       <!-- Dify 集成 -->
@@ -129,8 +142,10 @@ const form = reactive({
   poster_llm_model: '',
   poster_llm_api_key: '',
   poster_llm_base_url: '',
+  poster_image_provider: 'openai',
   poster_image_model: 'gpt-image-1',
   poster_image_api_key: '',
+  poster_image_base_url: 'https://api.openai.com/v1',
   dify_workspace_api_key: '',
 })
 
@@ -141,6 +156,20 @@ const DEFAULT_MODELS: Record<string, string> = {
   openai: 'gpt-4o',
 }
 
+const IMAGE_PROVIDER_PRESETS: Record<string, { model: string; baseUrl: string }> = {
+  openai: { model: 'gpt-image-1', baseUrl: 'https://api.openai.com/v1' },
+  doubao: { model: 'doubao-seedream-3-0-t2i-250415', baseUrl: 'https://ark.cn-beijing.volces.com/api/v3' },
+  zhipu: { model: 'cogview-4-250304', baseUrl: 'https://open.bigmodel.cn/api/paas/v4' },
+}
+
+function onImageProviderChange(val: string) {
+  const preset = IMAGE_PROVIDER_PRESETS[val]
+  if (preset) {
+    form.poster_image_model = preset.model
+    form.poster_image_base_url = preset.baseUrl
+  }
+}
+
 function onPptProviderChange(val: string) {
   if (val !== 'custom' && !form.ppt_llm_model) {
     form.ppt_llm_model = DEFAULT_MODELS[val] || ''