🏦 refactor: Centralize Caching & Redis Key Prefixing (#8457)

* 🔧 Overhauled caching feature:
- Refactored caching logic.
- Fixed redis prefix, namespace, tls, ttl, and cluster.
- Added REDIS_KEY_PREFIX_VAR

* # refactor: Rename redisCache to standardCache

* # Add Redis pinging mechanism to maintain connection.

* # docs: Add warning about Keyv Redis client prefix support

redis-config/redis-tls.conf

@@ -0,0 +1,31 @@
+port 0
+tls-port 6380
+tls-cert-file /Users/theotr/WebstormProjects/LibreChat/redis-cluster/certs/server-cert.pem
+tls-key-file /Users/theotr/WebstormProjects/LibreChat/redis-cluster/certs/server-key.pem
+tls-ca-cert-file /Users/theotr/WebstormProjects/LibreChat/redis-cluster/certs/ca-cert.pem
+tls-auth-clients no
+tls-dh-params-file /Users/theotr/WebstormProjects/LibreChat/redis-cluster/certs/redis.dh
+tls-protocols "TLSv1.2 TLSv1.3"
+tls-ciphersuites TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_128_GCM_SHA256
+tls-prefer-server-ciphers yes
+tls-session-caching no
+tls-session-cache-size 5000
+tls-session-cache-timeout 60
+bind 127.0.0.1
+protected-mode yes
+timeout 0
+tcp-keepalive 300
+daemonize no
+pidfile /var/run/redis_6379.pid
+loglevel notice
+logfile ""
+databases 16
+always-show-logo no
+save 900 1
+save 300 10
+save 60 10000
+stop-writes-on-bgsave-error yes
+rdbcompression yes
+rdbchecksum yes
+dbfilename dump.rdb
+dir ./