Initial commit: Backend with Bun.serve() + Drizzle ORM

- Bun 1.3.6 server setup
- MariaDB schema (projects, agents, tasks)
- Auto-migrations on startup
- WebSocket support
- Health check endpoint

Co-Authored-By: Claude Sonnet 4.5 (1M context) <noreply@anthropic.com>

.env.example

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+# Server
+NODE_ENV=development
+PORT=3000
+FRONTEND_URL=http://localhost:5173
+
+# Database (MariaDB in K8s)
+DB_HOST=mariadb.control-plane.svc.cluster.local
+DB_PORT=3306
+DB_USER=aiworker
+DB_PASSWORD=AiWorker2026_UserPass!
+DB_NAME=aiworker
+
+# Redis (will be deployed)
+REDIS_HOST=redis.control-plane.svc.cluster.local
+REDIS_PORT=6379
+REDIS_PASSWORD=
+
+# Gitea
+GITEA_URL=https://git.fuq.tv
+GITEA_TOKEN=your-gitea-token
+GITEA_OWNER=aiworker
+
+# Kubernetes
+K8S_IN_CLUSTER=false
+K8S_CONFIG_PATH=~/.kube/aiworker-config
+K8S_DEFAULT_NAMESPACE=aiworker
+
+# MCP Server
+MCP_SERVER_PORT=3100
+MCP_AUTH_TOKEN=your-mcp-token
+
+# JWT
+JWT_SECRET=your-secret-key-change-in-production
+JWT_EXPIRES_IN=7d
+
+# Claude API
+ANTHROPIC_API_KEY=your-anthropic-api-key
+
+# Logging
+LOG_LEVEL=info