fix(deploy): make the redis command flags take effect

The redis command is one quoted script given to the inner `sh -c`.
Docker compose keeps the newlines inside the quoted string, so
`redis-server` on the first line ran as a complete command with no
flags at all, and --save / --appendonly / --appendfsync after it were
silently never applied (`redis-cli CONFIG GET appendonly` said "no").

Trailing `\` line continuations fold the script back into one command.
Checked with redis:7-alpine: appendonly is now "yes" and save is
"60 1".

deploy/docker-compose.yml

@@ -241,12 +241,16 @@ services:
         hard: 100000
     volumes:
       - redis_data:/data
+    # The command is one quoted script for the inner `sh -c`. Compose keeps
+    # the newlines inside the quoted string, so every line needs a trailing
+    # `\` — without it, `redis-server` on the first line runs with no flags
+    # at all, and the --save/--appendonly/--appendfsync lines are never read.
     command: >
       sh -c '
-        redis-server
-        --save 60 1
-        --appendonly yes
-        --appendfsync everysec
+        redis-server \
+        --save 60 1 \
+        --appendonly yes \
+        --appendfsync everysec \
         ${REDIS_PASSWORD:+--requirepass "$REDIS_PASSWORD"}'
     environment:
       - TZ=${TZ:-Asia/Shanghai}