Phase 4.4: Context-aware entity filtering in Step 1

- OntologyGenerator.generate() now accepts template_filter_rules parameter
- When template_id is provided, API loads filter rules from templates.json
- Filter rules injected into ontology system prompt:
  - exclude_self: don't create entity for the business/brand that uploaded data
  - exclude_types: don't create specific entity types
  - focus: guide LLM to focus on specific entity categories
- API endpoint accepts template_id in form data

backend/app/services/ontology_generator.py

@@ -186,20 +186,22 @@ class OntologyGenerator:
         self,
         document_texts: List[str],
         simulation_requirement: str,
-        additional_context: Optional[str] = None
+        additional_context: Optional[str] = None,
+        template_filter_rules: Optional[Dict[str, Any]] = None
     ) -> Dict[str, Any]:
         """
-        生成本体定义
+        Generate ontology definition
         
         Args:
-            document_texts: 文档文本列表
-            simulation_requirement: 模拟需求描述
-            additional_context: 额外上下文
+            document_texts: Document text list
+            simulation_requirement: Simulation requirement description
+            additional_context: Additional context
+            template_filter_rules: Entity filter rules from template (e.g., exclude_types, exclude_self)
             
         Returns:
-            本体定义（entity_types, edge_types等）
+            Ontology definition (entity_types, edge_types, etc.)
         """
-        # 构建用户消息
+        # Build user message
         user_message = self._build_user_message(
             document_texts, 
             simulation_requirement,
@@ -208,6 +210,30 @@ class OntologyGenerator:
         
         lang_instruction = get_language_instruction()
         system_prompt = f"{ONTOLOGY_SYSTEM_PROMPT}\n\n{lang_instruction}\nIMPORTANT: Entity type names MUST be in English PascalCase (e.g., 'PersonEntity', 'MediaOrganization'). Relationship type names MUST be in English UPPER_SNAKE_CASE (e.g., 'WORKS_FOR'). Attribute names MUST be in English snake_case. Only description fields and analysis_summary should use the specified language above."
+        
+        # Add template-aware entity filtering rules
+        if template_filter_rules:
+            exclude_types = template_filter_rules.get('exclude_types', [])
+            exclude_self = template_filter_rules.get('exclude_self', False)
+            focus = template_filter_rules.get('focus', '')
+            
+            filter_instruction = "\n\n## Context-Aware Entity Filtering\n"
+            
+            if exclude_self:
+                filter_instruction += (
+                    "- IMPORTANT: The uploaded data is from a business/brand/advertiser. "
+                    "Do NOT create entity types for the business/brand that created this content. "
+                    "Only create entities for the TARGET AUDIENCE, competitors, influencers, media, etc.\n"
+                )
+            
+            if exclude_types:
+                filter_instruction += f"- Do NOT create entity types matching: {', '.join(exclude_types)}\n"
+            
+            if focus:
+                filter_instruction += f"- Focus entity types on: {focus}\n"
+            
+            system_prompt += filter_instruction
+        
         messages = [
             {"role": "system", "content": system_prompt},
             {"role": "user", "content": user_message}