Add initial project documentation

docs/deployment/homelab.md

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+# Homelab Deployment
+
+## Overview
+
+NexusAI is distributed across three nodes. Each node runs only the
+services appropriate for its hardware.
+
+## Mini PC 1 — 192.168.0.81
+
+Runs: Qdrant, Memory Service, Embedding Service
+```bash
+ssh username@192.168.0.81
+cd ~/nexusai
+docker compose -f docker-compose.mini1.yml up -d  # Qdrant
+npm run memory
+npm run embedding
+```
+
+## Mini PC 2 — 192.168.0.205
+
+Runs: Gitea, Orchestration Service
+```bash
+ssh username@192.168.0.205
+cd ~/gitea
+docker compose up -d                               # Gitea
+cd ~/nexusai
+npm run orchestration
+```
+
+## Main PC
+
+Runs: Ollama, Inference Service
+```bash
+ollama serve
+npm run inference
+```
+
+## Environment Files
+
+Each node needs a `.env` file in the relevant service package directory.
+These are not committed to git. See each service's documentation for
+required variables.