> v0.4.3 -> v0.5.0

## Summary

Replace Podman container isolation with bubblewrap (bwrap) sandbox for script execution, implementing systemd-run resource limits and graceful shutdown mechanism.

<details>
<summary>翻譯</summary>
以 bubblewrap (bwrap) 沙箱取代 Podman 容器隔離執行腳本，實作 systemd-run 資源限制與 graceful shutdown 機制。
</details>

## Changes

### FEAT

- Add bubblewrap sandbox execution with namespace isolation (unshare-all, share-net)
- Implement systemd-run resource limits (CPUQuota, MemoryMax, MemorySwapMax)
- Support Python, JavaScript, TypeScript runtime via wrapper scripts

<details>
<summary>翻譯</summary>

- 新增 bubblewrap 沙箱執行，支援命名空間隔離 (unshare-all, share-net)
- 實作 systemd-run 資源限制 (CPUQuota, MemoryMax, MemorySwapMax)
- 支援 Python、JavaScript、TypeScript 執行環境透過 wrapper 腳本

</details>

### REFACTOR

- Remove Podman container pool dependency, comment out container package code
- Restructure main.go with proper graceful shutdown using context timeout
- Simplify router to return `*http.Server` for external lifecycle control

<details>
<summary>翻譯</summary>

- 移除 Podman 容器池依賴，註解 container 套件程式碼
- 重構 main.go 實作 graceful shutdown，使用 context timeout
- 簡化 router 回傳 `*http.Server` 以支援外部生命週期控制

</details>

### UPDATE

- Rename environment variables: `MAX_CPUS_PER_CONTAINER` → `MAX_CPUS`, `MAX_MEMORY_PER_CONTAINER` → `MAX_MEMORY`
- Change memory format from bytes to human-readable (e.g., `128M`)

<details>
<summary>翻譯</summary>

- 重新命名環境變數：`MAX_CPUS_PER_CONTAINER` → `MAX_CPUS`，`MAX_MEMORY_PER_CONTAINER` → `MAX_MEMORY`
- 記憶體格式從 bytes 改為人類可讀格式（如 `128M`）

</details>

***

## Files Changed

| File | Status | Tag |
|------|--------|-----|
| `internal/sandbox/command.go` | Added | FEAT |
| `cmd/api/main.go` | Modified | REFACTOR |
| `internal/router.go` | Modified | REFACTOR |
| `internal/handler/run.go` | Modified | REFACTOR |
| `internal/handler/sse.go` | Modified | REFACTOR |
| `internal/container/build.go` | Modified | REFACTOR |
| `internal/container/container.go` | Modified | REFACTOR |
| `internal/container/health.go` | Modified | REFACTOR |
| `internal/container/operator.go` | Modified | REFACTOR |
| `.env.example` | Modified | UPDATE |
| `README.md` | Modified | DOC |
| `README.zh.md` | Modified | DOC |
| `cover.png` | Modified | CHORE |
| `package.json` | Added | CHORE |
| `.gitignore` | Modified | CHORE |

***

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