chore: initial commit

Laimiao agent v2 service: agent orchestration, sessions, billing,
gateway client, skills catalog, auth, config, plus tests.

.env.example

@@ -0,0 +1,53 @@
+NODE_ENV=development
+HOST=0.0.0.0
+PORT=8100
+CORS_ORIGIN=*
+APP_ROOT=
+DATA_DIR=data
+LOG_LEVEL=info
+FILE_FETCH_ALLOWED_HOSTS=
+
+BILLING_MODE=live
+BILLING_CURRENCY=credits
+DEFAULT_SKILL_PRICE=10
+DEFAULT_SKILL_MODEL=gpt-image-2
+DEFAULT_SKILL_SIZE=1024x1024
+
+MYSQL_HOST=127.0.0.1
+MYSQL_PORT=3306
+MYSQL_USER=root
+MYSQL_PASSWORD=
+MYSQL_DATABASE=laimiaodb
+MYSQL_CONNECTION_LIMIT=10
+MYSQL_CONNECT_TIMEOUT_MS=10000
+
+GATEWAY_CN_URL=https://cn.gateway.laimiaoai.com
+GATEWAY_GLOBAL_URL=https://gateway.laimiaoai.com
+GATEWAY_FORCE_URL=
+GATEWAY_MOCK=false
+GATEWAY_REQUEST_TIMEOUT_MS=180000
+GATEWAY_POLL_INTERVAL_MS=2000
+GATEWAY_POLL_TIMEOUT_MS=900000
+
+LAIMIAO_LLM_PROVIDER=laimiao
+LAIMIAO_LLM_BASE_URL=
+LAIMIAO_LLM_API_KEY=
+LAIMIAO_LLM_MODEL=deepseek-chat
+LAIMIAO_LLM_CONTEXT_WINDOW=131072
+LAIMIAO_LLM_MAX_TOKENS=8192
+LAIMIAO_LLM_REASONING=false
+LAIMIAO_LLM_THINKING=low
+
+JWT_KEY=
+JWT_ALGORITHM=HS256
+
+# 工具确认（通过 SSE 返回前端）
+TOOL_CONFIRMATION_ENABLED=true
+TOOL_CONFIRMATION_TOOLS=generate_image
+TOOL_CONFIRMATION_TIMEOUT_MS=300000
+
+# NODE_ENV=production 时启动会强制校验：
+#   JWT_KEY 必须非空，否则拒绝启动
+#   CORS_ORIGIN 不能是 *，必须是逗号分隔的显式来源（如 https://app.example.com）
+#   FILE_FETCH_ALLOWED_HOSTS 必须非空（文档/参考图只允许从这些域名下载）
+# FILE_FETCH_ALLOWED_HOSTS 示例：cdn.example.com,*.oss.example.com