Add test infrastructure with Docker services, CLI tools, and resolve Phase 0 questions

Stand up local dev infrastructure (OPC UA, LDAP, MS SQL) with Docker Compose,
Python CLI tools for service interaction, and teardown script. Fix GLAuth config
mount, OPC PLC node format, and document actual DN/namespace behavior discovered
during testing. Resolve Q1-Q8,Q10: .NET 10, Akka.NET 1.5.x, monorepo with slnx,
appsettings JWT, Windows Server 2022 site target.

infra/docker-compose.yml

@@ -0,0 +1,45 @@
+services:
+  opcua:
+    image: mcr.microsoft.com/iotedge/opc-plc:latest
+    container_name: scadalink-opcua
+    ports:
+      - "50000:50000"
+      - "8080:8080"
+    volumes:
+      - ./opcua/nodes.json:/app/config/nodes.json:ro
+    command: >
+      --autoaccept
+      --unsecuretransport
+      --sph
+      --sn=5 --sr=10 --st=uint
+      --fn=5 --fr=1 --ft=uint
+      --gn=5
+      --nf=/app/config/nodes.json
+      --pn=50000
+    restart: unless-stopped
+
+  ldap:
+    image: glauth/glauth:latest
+    container_name: scadalink-ldap
+    ports:
+      - "3893:3893"
+    volumes:
+      - ./glauth/config.toml:/app/config/config.cfg:ro
+    restart: unless-stopped
+
+  mssql:
+    image: mcr.microsoft.com/mssql/server:2022-latest
+    container_name: scadalink-mssql
+    ports:
+      - "1433:1433"
+    environment:
+      ACCEPT_EULA: "Y"
+      MSSQL_SA_PASSWORD: "ScadaLink_Dev1!"
+      MSSQL_PID: "Developer"
+    volumes:
+      - scadalink-mssql-data:/var/opt/mssql
+      - ./mssql/setup.sql:/docker-entrypoint-initdb.d/setup.sql:ro
+    restart: unless-stopped
+
+volumes:
+  scadalink-mssql-data: