feat: introduce WeKnora Lite edition with lightweight configuration and deployment

- Added a new `.env.lite.example` file for the Lite version, providing a minimal configuration template.
- Updated `.env.example` to remove deprecated variables and include new Docreader settings.
- Enhanced Docker configurations to support the Lite version, including a new Dockerfile for the Docreader service.
- Introduced a Makefile target for building and running the Lite version, along with packaging capabilities.
- Created GitHub workflows for building and releasing Lite binaries, including Homebrew formula support.
- Implemented a new service file for managing the Lite version as a system service.

This update enables a streamlined, single-binary deployment of WeKnora, reducing external dependencies and simplifying setup.

.gitignore

@@ -1,5 +1,6 @@
 # 忽略.env文件和其他包含敏感信息的配置文件
 .env
+.env.lite
 # 但不忽略示例文件
 !.env.example
 *.pem
@@ -27,9 +28,15 @@ logs/
 *.pid
 
 WeKnora
+WeKnora-lite
 /models/
 test/data/mswag.txt
 data/files/
+data/weknora.db
+data/weknora.db-wal
+data/weknora.db-shm
+
+web/
 
 .venv/
 **/__pycache__