chore: ARTEX 初始化

ARTEX — AI 自主渗透测试系统（Go 后端 + Next.js 前端，单二进制内嵌）。

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

.gitignore

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+# backend
+/data/
+*.db
+*.db-wal
+*.db-shm
+config.json
+scheduler_state.json
+__pycache__/
+*.pyc
+*.pyo
+
+# frontend
+web/node_modules/
+web/.next/
+web/tsconfig.tsbuildinfo
+web/next-env.d.ts
+*.local
+
+# development tools
+.playwright-mcp/
+.playwright-cli/
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# docs
+/docs/
+
+# os
+.DS_Store
+Thumbs.db
+
+# claude code local state
+.claude/
+
+# 内嵌前端的单二进制产物
+/artex
+/server/webui/dist/
+
+# Docker 部署生成的本地环境（含密码/密钥，不提交）
+.env