fix(databases): update default Redis version from 7 to 8 (#4224)

Update Redis default image from redis:7 to redis:8 in:
- packages/server/src/setup/redis-setup.ts (internal Redis setup)
- packages/server/src/services/ai.ts (AI service template examples)
- apps/dokploy/components/dashboard/project/add-database.tsx (UI default)

Redis 8 provides better performance according to benchmarks while
maintaining stability. Closes #4172.

packages/server/src/services/ai.ts

@@ -198,12 +198,12 @@ export const suggestVariants = async ({
 		    1. ALWAYS use 'image:' field, NEVER use 'build:' field
 		    2. NEVER use 'build: .' or any build directive - we don't have local Dockerfiles
 		    3. Use images from Docker Hub or other public registries (e.g., docker.io, ghcr.io, quay.io)
-		    4. For dependencies (databases, redis, etc.), use official images (e.g., postgres:16, redis:7, etc.)
+		    4. For dependencies (databases, redis, etc.), use official images (e.g., postgres:16, redis:8, etc.)
 		    5. Always specify image tags - avoid using 'latest' tag, use specific versions when possible
 		    6. Examples of correct image usage:
 		       - image: sendingtk/chatwoot:develop
 		       - image: postgres:16-alpine
-		       - image: redis:7-alpine
+		       - image: redis:8-alpine
 		    7. Examples of INCORRECT usage (DO NOT USE):
 		       - build: .
 		       - build: ./app

packages/server/src/setup/redis-setup.ts

@@ -3,7 +3,7 @@ import { docker } from "../constants";
 import { pullImage } from "../utils/docker/utils";
 
 export const initializeRedis = async () => {
-	const imageName = "redis:7";
+	const imageName = "redis:8";
 	const containerName = "dokploy-redis";
 
 	const settings: CreateServiceOptions = {