docs: add clickable links for file paths in markdown

docs/LOCAL_DEV_RUNBOOK.md

@@ -5,6 +5,8 @@
 cd backend
 ./scripts/start_dev.sh
 ```
+- 專案路徑：[backend](../backend)
+- 啟動腳本：[backend/scripts/start_dev.sh](../backend/scripts/start_dev.sh)
 
 ## 2) 啟動前端
 ```bash
@@ -12,8 +14,9 @@ cd frontend
 npm install
 npm run dev
 ```
+- 專案路徑：[frontend](../frontend)
 
-## 3) 必要環境變數（backend/.env.development）
+## 3) 必要環境變數（[backend/.env.development](../backend/.env.development)）
 - `KEYCLOAK_BASE_URL`
 - `KEYCLOAK_REALM`
 - `KEYCLOAK_CLIENT_ID`