feat: initialize Nuanji (Warm Notes) project

- Base platform from base.git (ERP base: auth, core, config, message, workflow, plugin)
- Created erp-diary module skeleton (lib.rs, dto.rs, error.rs, event.rs, state.rs)
- Integrated erp-diary into workspace and erp-server
- Added DiaryModule registration in main.rs
- Added DiaryState FromRef in state.rs
- Diary routes mounted (empty routes, ready for implementation)
- Product design spec v1.2 preserved in docs/
- Implementation plan preserved in plans/

Cargo check: OK
Cargo test: OK (78+ base tests passing)

docker/nginx/ssl/.gitkeep

@@ -0,0 +1,8 @@
+# 将 SSL 证书放置在此目录
+# 必需文件: fullchain.pem + privkey.pem
+# 生产环境建议使用 Let's Encrypt 或云服务商证书管理
+#
+# Let's Encrypt 示例:
+#   certbot certonly --standalone -d your-domain.com
+#   cp /etc/letsencrypt/live/your-domain.com/fullchain.pem .
+#   cp /etc/letsencrypt/live/your-domain.com/privkey.pem .