feat: enhance UI, refactor services, improve templates and tests

- Replace image_extractor with pdf_image_extractor service
- Enhance pi_client with expanded API capabilities
- Improve summarizer service with additional features
- Update admin routes with more endpoints
- Add login page template
- Enhance detail page with comprehensive layout
- Improve search and trends pages
- Update base template with additional elements
- Refactor tests for better coverage
- Add validate_summary script
- Update project configuration and dependencies

tests/test_schemas.py

@@ -64,10 +64,9 @@ class TestSummarySchema:
             SummarySchema.model_validate(sample_summary_dict)
 
     def test_extra_fields_ignored(self, sample_summary_dict):
-        sample_summary_dict["figures"] = ["fig1.png"]
         sample_summary_dict["takeaway"] = "important paper"
         schema = SummarySchema.model_validate(sample_summary_dict)
-        assert not hasattr(schema, "figures")
+        assert not hasattr(schema, "takeaway")
         assert schema.title_zh  # 正常解析
 
     def test_flatten_for_db(self, sample_summary_dict):
@@ -80,7 +79,7 @@ class TestSummarySchema:
         assert "updated_at" in flat
         # JSON 字段可解析
         assert isinstance(json.loads(flat["prerequisites_json"]), dict)
-        assert isinstance(json.loads(flat["method_steps_json"]), list)
+        assert isinstance(flat["figures_json"], str)  # figures 序列化为 JSON
 
 
 # ═══════════════════════════════════════════════════════════════════════
@@ -99,7 +98,7 @@ class TestQualityAssessment:
         sample_summary_dict["motivation"]["goal"] = ""
         sample_summary_dict["motivation"]["gap"] = ""
         sample_summary_dict["method"]["overview"] = ""
-        sample_summary_dict["results"]["main_findings"] = []
+        sample_summary_dict["results"]["main_findings"] = ""
         schema = SummarySchema.model_validate(sample_summary_dict)
         assert assess_quality(schema) == "degraded"