Expand OpenManage AI documentation with architecture and deploy context.

Keeps runtime data and secrets out of git; documents relationship to OME Cockpit.

SETUP.md

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+# OpenManage AI — ready to use
+
+URL: http://atc-portal01.dell-atc.lan:3080
+
+## Login
+- Email: the address you used at signup (not the display name "admin")
+- Password: your Open WebUI password
+
+## Use this model
+Select **OME Copilot** (not bare llama3-70b-gptq).
+
+Ask:
+- How many iDRACs are managed and how many servers are currently connected?
+- Give me the OME fleet summary
+
+Expected (live from OME REST): **42 iDRACs**, **20 connected servers**.
+
+## Why not raw MCP yet?
+OME native MCP requires a `login` tool, but the appliance currently drops the MCP session after login
+(`Session not found` / odd `host.docker.internal` target).  
+We therefore use the **OME Fleet** tool (REST API) for reliable demo answers.
+
+MCP server entry remains in External Tools (disabled) for when OAuth/session is fixed.
+
+## Ops
+```bash
+cd /home/lab/openmanage && docker compose ps
+df -h / /home
+```