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/vision/vision.interface.ts

@@ -0,0 +1,37 @@
+/**
+ * Vision Service Interface Definitions
+ */
+
+export interface VisionAnalysisResult {
+  text: string; // Extracted text content
+  images: ImageDescription[]; // Image description
+  layout: string; // Layout type
+  confidence: number; // Confidence (0-1)
+  pageIndex?: number; // Page number
+}
+
+export interface ImageDescription {
+  type: string; // Image type (chart/diagram/flowchart etc.)
+  description: string; // Detailed description
+  position?: number; // Position in page
+}
+
+export interface VisionModelConfig {
+  baseUrl: string;
+  apiKey: string;
+  modelId: string;
+}
+
+export interface BatchAnalysisResult {
+  results: VisionAnalysisResult[];
+  totalPages: number;
+  successCount: number;
+  failedCount: number;
+  estimatedCost: number; // Estimated cost(USD)
+}
+
+export interface PageQuality {
+  isGood: boolean;
+  reason?: string;
+  score?: number;
+}