wuyouzhuguli/SpringAll ? reverse-engineered prompt

Build me a Spring learning playground that matches this repo, with a bunch of small example projects grouped by topic so I can study one feature at a time.

I want separate mini apps for Spring Boot basics, database access, caching, templates, logging, testing, Swagger, Actuator, email, async calls, filters and interceptors, WebFlux, WebSocket, MongoDB, Kafka, and the more advanced security parts like Shiro, Spring Security, JWT, and OAuth2. Also include a few microservice examples like service discovery, client side load balancing, gateway routing, config management, tracing, and Alibaba Nacos and Sentinel. If it helps, look up current docs online while you build.

Keep everything simple, runnable, and easy to learn from, with clear README notes for each example and sensible starter code so I can open any folder and see how the feature works right away.