Add redis: Boot 4.1 + Spring Data Redis 4.1, the JDK-serialisation default vs Jackson 3 serializers, @RedisHash TTL and keyspace events, @RedisListener, and Redis as the Spring cache

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3

redis/docs/output/05-two-templates-two-keyspaces.txt

@@ -0,0 +1,16 @@
+# Same key name, two templates, two different keys
+
+
+--- Write user:1 with StringRedisTemplate ---
+stringTemplate.opsForValue().get("user:1")  = from-string-template
+redisTemplate.opsForValue().get("user:1")   = null
+
+--- Write user:1 with the default RedisTemplate ---
+stringTemplate.opsForValue().get("user:1")  = from-string-template
+redisTemplate.opsForValue().get("user:1")   = from-default-template
+
+--- What Redis holds ---
+$ redis-cli -p 6390 --no-raw DBSIZE
+(integer) 2
+$ redis-cli -p 6390 --no-raw GET user:1
+"from-string-template"