feat: implement QuestionBank CRUD with pagination and template query

- Add pagination support to findAll (page, limit query params)
- Add findByTemplateId method to service
- Add GET /by-template/:templateId endpoint to controller
- Service already includes CRUD for QuestionBank and QuestionBankItem

server/src/defaults.ts

@@ -0,0 +1,28 @@
+// server/src/defaults.ts
+import { AppSettings, ModelConfig, ModelType } from './types'; // Import from local types
+
+export const DEFAULT_MODELS: ModelConfig[] = [];
+
+export const DEFAULT_SETTINGS: AppSettings = {
+  selectedLLMId: '',
+  selectedEmbeddingId: '',
+  selectedRerankId: '',
+
+  temperature: 0.3,
+  maxTokens: 8192,
+
+  enableRerank: false,
+  topK: 4,
+  similarityThreshold: 0.3,
+  rerankSimilarityThreshold: 0.5,
+  enableFullTextSearch: false,
+  hybridVectorWeight: 0.7,
+
+  enableQueryExpansion: false,
+  enableHyDE: false,
+
+  chunkSize: 1000,
+  chunkOverlap: 100,
+
+  language: 'zh',
+};