Add self-deploying setup scripts for all sub-projects (P1-P8)

- Root setup.sh orchestrator with per-phase dispatch (./setup.sh p1..p8 | all | status)
- Makefile convenience targets (make infra, make llm, make status, etc.)
- scripts/common.sh: shared bash library for OS detection, Docker helpers,
  service management (launchd/systemd), package install, env management
- .env.example + .gitignore: shared config template and secret exclusions

P1 (homeai-infra): full implementation
- docker-compose.yml: Uptime Kuma, code-server, n8n
- Note: Home Assistant, Portainer, Gitea are pre-existing instances
- setup.sh: Docker install, homeai network, container health checks

P2 (homeai-llm): full implementation
- Ollama native install with CUDA/ROCm/Metal auto-detection
- launchd plist (macOS) + systemd service (Linux) for auto-start
- scripts/pull-models.sh: idempotent model puller from manifest
- scripts/benchmark.sh: tokens/sec measurement per model
- Open WebUI on port 3030 (avoids Gitea :3000 conflict)

P3-P8: working stubs with prerequisite checks and TODO sections

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

homeai-llm/launchd/com.homeai.ollama.plist

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN"
+  "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>Label</key>
+  <string>com.homeai.ollama</string>
+
+  <key>ProgramArguments</key>
+  <array>
+    <string>/usr/local/bin/ollama</string>
+    <string>serve</string>
+  </array>
+
+  <key>EnvironmentVariables</key>
+  <dict>
+    <key>OLLAMA_HOST</key>
+    <string>0.0.0.0:11434</string>
+    <!-- Metal GPU is used automatically on Apple Silicon; no env var needed -->
+  </dict>
+
+  <key>RunAtLoad</key>
+  <true/>
+
+  <key>KeepAlive</key>
+  <true/>
+
+  <key>StandardOutPath</key>
+  <string>/tmp/homeai-ollama.log</string>
+
+  <key>StandardErrorPath</key>
+  <string>/tmp/homeai-ollama-error.log</string>
+
+  <key>ThrottleInterval</key>
+  <integer>5</integer>
+</dict>
+</plist>