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/api/graph.py

@@ -154,9 +154,27 @@ def generate_ontology():
         simulation_requirement = request.form.get('simulation_requirement', '')
         project_name = request.form.get('project_name', 'Unnamed Project')
         additional_context = request.form.get('additional_context', '')
+        template_id = request.form.get('template_id', '')
         
         logger.debug(f"项目名称: {project_name}")
         logger.debug(f"模拟需求: {simulation_requirement[:100]}...")
+        if template_id:
+            logger.debug(f"Template: {template_id}")
+        
+        # Load template filter rules if template_id provided
+        template_filter_rules = None
+        if template_id:
+            import json as _json
+            _templates_path = os.path.join(os.path.dirname(__file__), '..', 'templates.json')
+            try:
+                with open(_templates_path, 'r', encoding='utf-8') as _f:
+                    _templates = _json.load(_f)['templates']
+                for _tmpl in _templates:
+                    if _tmpl['id'] == template_id:
+                        template_filter_rules = _tmpl.get('entity_filter', {})
+                        break
+            except Exception:
+                pass
         
         if not simulation_requirement:
             return jsonify({
@@ -218,7 +236,8 @@ def generate_ontology():
         ontology = generator.generate(
             document_texts=document_texts,
             simulation_requirement=simulation_requirement,
-            additional_context=additional_context if additional_context else None
+            additional_context=additional_context if additional_context else None,
+            template_filter_rules=template_filter_rules
         )
         
         # 保存本体到项目