chore: force Docker cache invalidation for HuggingFace

fix: remove source file deletion that breaks Next.js build

fix: optimize Docker build to reduce storage usage on HuggingFace

fix: Python 3.9 compatibility for HuggingFace Spaces

fix: add HuggingFace domains to ALLOWED_ORIGINS

fix: correct uvicorn startup path for HuggingFace Spaces

fix: resolve all linting and formatting errors

refactor: reorganize project structure and add new features

fix: resolve SQL parameter binding and add enhanced upload feedback

docs: update README with RAG application details

feat: implement complete RAG application with frontend and backend

feat: implement core RAG services with TDD and enhanced pre-commit hooks

更新 .gitignore 以排除 .env.example 和新增上傳及儲存相關的檔案類型；擴充 requirements.txt，新增多個依賴項以支援 PDF 處理、資料庫連接及測試工具；修改 main.py，更新 FastAPI 應用程式的標題、版本及描述，並加入資料庫初始化的生命週期管理。

Fix Dockerfile COPY syntax error

Fix missing public directory error

Update Dockerfile to use npm install instead of npm ci

Fix Docker build: add package-lock.json and update npm install

Add Next.js + FastAPI configuration for Hugging Face Spaces

initial commit