feat: Add curated expert occupations with local data sources

- Add curated occupations seed files (210 entries in zh/en) with specific domains
- Add DBpedia occupations data (2164 entries) for external source option
- Refactor expert_source_service to read from local JSON files
- Improve keyword generation prompts to leverage expert domain context
- Add architecture analysis documentation (ARCHITECTURE_ANALYSIS.md)
- Fix expert source selection bug (proper handling of empty custom_experts)
- Update frontend to support curated/dbpedia/wikidata expert sources

Key changes:
- backend/app/data/: Local occupation data files
- backend/app/services/expert_source_service.py: Simplified local file reading
- backend/app/prompts/expert_transformation_prompt.py: Better domain-aware prompts
- Removed expert_cache.py (no longer needed with local files)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/TransformationInputPanel.tsx

@@ -7,8 +7,9 @@ const { Title, Text } = Typography;
 
 const EXPERT_SOURCE_OPTIONS = [
   { label: 'LLM 生成', value: 'llm' as ExpertSource, description: '使用 AI 模型生成專家' },
-  { label: 'Wikidata', value: 'wikidata' as ExpertSource, description: '從維基數據查詢職業' },
-  { label: 'ConceptNet', value: 'conceptnet' as ExpertSource, description: '從知識圖譜查詢概念' },
+  { label: '精選職業', value: 'curated' as ExpertSource, description: '從 210 個常見職業隨機選取（含具體領域）' },
+  { label: 'DBpedia', value: 'dbpedia' as ExpertSource, description: '從 DBpedia 隨機選取職業 (2164 筆)' },
+  { label: 'Wikidata', value: 'wikidata' as ExpertSource, description: '從 Wikidata 查詢職業 (需等待 API)' },
 ];
 
 interface TransformationInputPanelProps {

frontend/src/hooks/useExpertTransformation.ts

@@ -155,7 +155,7 @@ export function useExpertTransformation(options: UseExpertTransformationOptions
         });
       });
     },
-    [options.model, options.temperature]
+    [options.model, options.temperature, options.expertSource]
   );
 
   const transformAll = useCallback(

frontend/src/types/index.ts

@@ -230,7 +230,7 @@ export interface ExpertTransformationDAGResult {
   results: ExpertTransformationCategoryResult[];
 }
 
-export type ExpertSource = 'llm' | 'wikidata' | 'conceptnet';
+export type ExpertSource = 'llm' | 'curated' | 'dbpedia' | 'wikidata';
 
 export interface ExpertTransformationRequest {
   query: string;
@@ -240,7 +240,7 @@ export interface ExpertTransformationRequest {
   keywords_per_expert: number;       // 1-3
   custom_experts?: string[];         // ["藥師", "工程師"]
   expert_source?: ExpertSource;      // 專家來源 (default: 'llm')
-  expert_language?: string;          // 外部來源語言 (default: 'zh')
+  expert_language?: string;          // 外部來源語言 (default: 'en')
   model?: string;
   temperature?: number;
 }