🚀 feat: Support Redis Clusters, Trusted Proxy Setting, And Toggle Meilisearch Indexing (#5963)

* refactor: Improve MeiliSearch integration with environment-based configuration for running index sync

* chore: Remove Question issue template from GitHub repository

* feat: Enable indexing in MeiliSearch configuration and clean up error handling in indexSync

* feat: Update .env.example to include optional indexing configuration

* refactor: rename env var for disabling index sync to MEILI_NO_SYNC

* Added the option to change the default trusted proxy

* feat: Add TRUST_PROXY configuration to .env.example for reverse proxy settings

* feat: Enhance Redis support with cluster configuration and TLS options

* feat(redis): add cluster support, environment config and url mapping

- Add Redis cluster configuration with isEnabled flag
- Configure prefix and max listeners settings
- Improve code formatting and readability
- Fix URL vs host parameter handling
- Update environment variables and regex patterns

---------

Co-authored-by: Gil Assunção <gil.assuncao@parceiros.nos.pt>
Co-authored-by: Pedro Reis <pedro.malheiro@parceiros.nos.pt>
Co-authored-by: João Trigo Soares <joao.soares@parceiros.nos.pt>

.env.example

@@ -20,6 +20,11 @@ DOMAIN_CLIENT=http://localhost:3080
 DOMAIN_SERVER=http://localhost:3080
 
 NO_INDEX=true
+# Use the address that is at most n number of hops away from the Express application. 
+# req.socket.remoteAddress is the first hop, and the rest are looked for in the X-Forwarded-For header from right to left. 
+# A value of 0 means that the first untrusted address would be req.socket.remoteAddress, i.e. there is no reverse proxy.
+# Defaulted to 1.
+TRUST_PROXY=1
 
 #===============#
 # JSON Logging  #
@@ -292,6 +297,10 @@ MEILI_NO_ANALYTICS=true
 MEILI_HOST=http://0.0.0.0:7700
 MEILI_MASTER_KEY=DrhYf7zENyR6AlUCKmnz0eYASOQdl6zxH7s7MKFSfFCt
 
+# Optional: Disable indexing, useful in a multi-node setup
+# where only one instance should perform an index sync.
+# MEILI_NO_SYNC=true
+
 #==================================================#
 #          Speech to Text & Text to Speech         #
 #==================================================#
@@ -495,6 +504,16 @@ HELP_AND_FAQ_URL=https://librechat.ai
 # Google tag manager id
 #ANALYTICS_GTM_ID=user provided google tag manager id
 
+#===============#
+# REDIS Options #
+#===============#
+
+# REDIS_URI=10.10.10.10:6379
+# USE_REDIS=true
+
+# USE_REDIS_CLUSTER=true
+# REDIS_CA=/path/to/ca.crt
+
 #==================================================#
 #                      Others                      #
 #==================================================#
@@ -502,9 +521,6 @@ HELP_AND_FAQ_URL=https://librechat.ai
 
 # NODE_ENV=
 
-# REDIS_URI=
-# USE_REDIS=
-
 # E2E_USER_EMAIL=
 # E2E_USER_PASSWORD=