feat: support Java prompt_context passthrough (Plan A)

- content_generate_v2: use Java prompt_context if provided, fallback to local
- topic_generate_v2: same passthrough support
- Maintains backward compatibility with direct Python calls

domain/aigc/engines/content_generate_v2.py

@@ -121,6 +121,9 @@ class ContentGenerateEngineV2(BaseAIGCEngine):
             self.log("开始生成内容 (V2)")
             self.set_progress(task_id, 10)
             
+            # 🎯 方案A: 检查是否有 Java 透传的 prompt_context
+            prompt_context = params.get('prompt_context')
+            
             # 提取参数
             topic = params.get('topic', {})
             
@@ -149,26 +152,37 @@ class ContentGenerateEngineV2(BaseAIGCEngine):
             # 获取 PromptRegistry
             prompt_registry = self._get_prompt_registry()
             
-            # 从 subject 提取产品信息
-            current_product = None
-            if subject and subject.get('products'):
-                current_product = subject['products'][0]
-            
-            # 如果没有用户指定的参考内容，加载内置参考文献库
-            use_builtin_examples = not reference or reference.get('mode') == 'none'
-            
-            # 构建 prompt 上下文
-            context = {
-                'style_content': self._format_style(style, topic),
-                'demand_content': self._format_audience(audience, topic),
-                'object_content': self._format_subject(subject, topic),
-                'product_content': self._format_product(current_product),
-                'hot_topics': hot_topics,
-                'reference': reference,
-                # 内置参考文献 (仅在无用户指定参考时使用)
-                'title_examples': self._get_title_examples(20) if use_builtin_examples else None,
-                'content_examples': self._get_content_examples(3) if use_builtin_examples else None,
-            }
+            # 🎯 方案A: 如果有 Java 透传的 context，直接使用；否则本地构建
+            if prompt_context:
+                self.log("使用 Java 透传的 prompt_context")
+                context = prompt_context
+                # 补充可能缺少的字段
+                if 'hot_topics' not in context and hot_topics:
+                    context['hot_topics'] = hot_topics
+                if 'reference' not in context and reference:
+                    context['reference'] = reference
+            else:
+                self.log("使用本地构建的 context (兼容模式)")
+                # 从 subject 提取产品信息
+                current_product = None
+                if subject and subject.get('products'):
+                    current_product = subject['products'][0]
+                
+                # 如果没有用户指定的参考内容，加载内置参考文献库
+                use_builtin_examples = not reference or reference.get('mode') == 'none'
+                
+                # 构建 prompt 上下文
+                context = {
+                    'style_content': self._format_style(style, topic),
+                    'demand_content': self._format_audience(audience, topic),
+                    'object_content': self._format_subject(subject, topic),
+                    'product_content': self._format_product(current_product),
+                    'hot_topics': hot_topics,
+                    'reference': reference,
+                    # 内置参考文献 (仅在无用户指定参考时使用)
+                    'title_examples': self._get_title_examples(20) if use_builtin_examples else None,
+                    'content_examples': self._get_content_examples(3) if use_builtin_examples else None,
+                }
             
             # 渲染 prompt
             system_prompt, user_prompt = prompt_registry.render(

domain/aigc/engines/topic_generate_v2.py

@@ -158,20 +158,35 @@ class TopicGenerateEngineV2(BaseAIGCEngine):
             # 获取 PromptRegistry
             prompt_registry = self._get_prompt_registry()
             
-            # 构建 prompt 上下文
-            context = {
-                'num_topics': num_topics,
-                'month': month,
-                'subject': subject,
-                # 兼容旧 prompt 模板
-                'scenic_spot': subject,
-                'product': subject.get('products', [{}])[0] if subject and subject.get('products') else product,
-                'style': style,
-                'audience': audience,
-                'hot_topics': hot_topics,
-                'styles_list': self._format_list(styles_list),
-                'audiences_list': self._format_list(audiences_list),
-            }
+            # 🎯 方案A: 检查是否有 Java 透传的 prompt_context
+            prompt_context = params.get('prompt_context')
+            
+            if prompt_context:
+                self.log("使用 Java 透传的 prompt_context")
+                context = prompt_context
+                # 补充必要字段
+                if 'num_topics' not in context:
+                    context['num_topics'] = num_topics
+                if 'month' not in context:
+                    context['month'] = month
+                if 'hot_topics' not in context and hot_topics:
+                    context['hot_topics'] = hot_topics
+            else:
+                self.log("使用本地构建的 context (兼容模式)")
+                # 构建 prompt 上下文
+                context = {
+                    'num_topics': num_topics,
+                    'month': month,
+                    'subject': subject,
+                    # 兼容旧 prompt 模板
+                    'scenic_spot': subject,
+                    'product': subject.get('products', [{}])[0] if subject and subject.get('products') else product,
+                    'style': style,
+                    'audience': audience,
+                    'hot_topics': hot_topics,
+                    'styles_list': self._format_list(styles_list),
+                    'audiences_list': self._format_list(audiences_list),
+                }
             
             # 渲染 prompt
             system_prompt, user_prompt = prompt_registry.render(