feat: add multi-arch Docker builds and Mac Mini deployment

- CI: Build Docker images for linux/amd64 + linux/arm64
- CI: Add manacore-web to build matrix
- Add docker-compose.macmini.yml for Mac Mini deployment
- Add cloudflared-config.yml for Cloudflare Tunnel routing
- Add Mac Mini deployment scripts and documentation
- Configure Cloudflared as launchd service for auto-start

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.env.macmini.example

@@ -0,0 +1,33 @@
+# Mac Mini Production Environment
+# Copy to .env.macmini and fill in the values
+
+# ============================================
+# Database (PostgreSQL)
+# ============================================
+POSTGRES_PASSWORD=your-secure-password-here
+
+# ============================================
+# Redis
+# ============================================
+REDIS_PASSWORD=your-redis-password-here
+
+# ============================================
+# JWT Keys (generate with: openssl rand -base64 32)
+# For EdDSA keys, use mana-core-auth key generation
+# ============================================
+JWT_SECRET=your-jwt-secret-here
+# Leave empty to use auto-generated keys
+JWT_PUBLIC_KEY=
+JWT_PRIVATE_KEY=
+
+# ============================================
+# Supabase (optional, for legacy features)
+# ============================================
+SUPABASE_URL=
+SUPABASE_SERVICE_ROLE_KEY=
+
+# ============================================
+# Azure OpenAI (for Chat AI features)
+# ============================================
+AZURE_OPENAI_ENDPOINT=https://your-resource.openai.azure.com/
+AZURE_OPENAI_API_KEY=your-api-key-here