chore(infra): remove LmxFakeProxy — replaced by real LmxProxy v2 instances on windev

LmxFakeProxy is no longer needed now that two real LmxProxy v2 instances
are available for testing. Added remote test infra section to test_infra.md
documenting the windev instances. Removed tagsim (never committed).

infra/docker-compose.yml

@@ -95,20 +95,6 @@ services:
       - scadalink-net
     restart: unless-stopped
 
-  lmxfakeproxy:
-    build: ./lmxfakeproxy
-    container_name: scadalink-lmxfakeproxy
-    ports:
-      - "50051:50051"
-    environment:
-      OPC_ENDPOINT: "opc.tcp://opcua:50000"
-      OPC_PREFIX: "ns=3;s="
-    depends_on:
-      - opcua
-    networks:
-      - scadalink-net
-    restart: unless-stopped
-
   playwright:
     image: mcr.microsoft.com/playwright:v1.58.2-noble
     container_name: scadalink-playwright