doc: update backend doc

assets/coconut-leaf.template.toml

@@ -1,10 +1,12 @@
+# Driver: "sqlite" or "mysql"
 [database]
 driver = "sqlite"
 
+# Path to the SQLite database file
 [database.config]
 path = "coconut-leaf.db"
 
-# MySQL（占位，尚未实现）
+# MySQL connection parameters (placeholder, not yet implemented)
 # [database]
 # driver = "mysql"
 #
@@ -15,9 +17,12 @@ path = "coconut-leaf.db"
 # password = "password"
 # database = "coconut_leaf"
 
+# HTTP listening port
 [web]
 port = 8848
 
 [others]
-auto-token-clean-duration = 86400   # 自动清理过期 token 的间隔（秒）
+# Interval (in seconds) for automatic cleanup of expired tokens
-debug = true                        # 开启后日志级别降到 DEBUG
+auto-token-clean-duration = 86400
+# Debug mode; must be set to false in production
+debug = true

backend/README.md

@@ -1,70 +1,69 @@
-# coconut-leaf 后端
+# coconut-leaf Backend
 
-coconut-leaf 的后端服务，使用 [Go](https://go.dev/) + [Gin](https://gin-gonic.com/) 实现，由旧版 Python Flask 后端迁移而来。
+The backend service of coconut-leaf, 
-数据层直接执行 SQL（不使用 ORM），目前仅完整实现 SQLite，MySQL 接口为占位实现（全部接口返回 not implemented 错误）。
+implemented with [Go](https://go.dev/) + [Gin](https://gin-gonic.com/), 
+migrated from the old Python Flask backend.
+The data layer executes SQL directly (no ORM).
 
-## 环境要求
+> [!NOTE]
+> Currently only SQLite is fully implemented.
+> MySQL interfaces are placeholders (all endpoints return "not implemented" errors).
+
+## Requirements
 
 - **Go >= 1.26**
-- **C 编译器（cgo）**：SQLite 驱动 [`mattn/go-sqlite3`](https://github.com/mattn/go-sqlite3) 依赖 cgo。
+- **C compiler (cgo)**: The SQLite driver [`mattn/go-sqlite3`](https://github.com/mattn/go-sqlite3) requires CGO feature.
-  - Windows：推荐使用 MSYS2 的 gcc。
+  - Windows: MSYS2's gcc is recommended.
-  - Linux / macOS：系统自带的 gcc / clang 即可。
+  - Linux / macOS: System-provided gcc / clang works.
-- 构建前确保 `CGO_ENABLED=1`（有可用 C 编译器时通常默认开启）。
+- Ensure `CGO_ENABLED=1` before building (usually enabled by default when a C compiler is available).
 
-## 构建
+## Build
 
-在 `backend/` 目录下：
+In the `backend/` directory:
 
 ```sh
 go build -o coconut-leaf
 ```
 
 > [!NOTE]
-> 首次构建会编译 SQLite 的 C 源，耗时 1–3 分钟属正常。
+> The first build compiles SQLite C source code; 1–3 minutes is normal.
-> 
+>
-> 在 Windows 下用 MSYS2 编译出的可执行文件在运行时依赖 MSYS2 相关运行库（我这里是MSYS2 UCRT64，所以可能包含 `libgcc_s_*`、`libwinpthread-1.dll` 等）。
+> On Windows, executables built with MSYS2 depend on MSYS2 runtime libraries 
-> 需让这些DLL所在文件夹处于 PATH 中，或将这些 DLL 拷贝到可执行文件旁。
+> (I use MSYS2 UCRT64, so it may include `libgcc_s_*`, `libwinpthread-1.dll`, etc.).
+> Either add the DLL directory to PATH or copy those DLLs next to the executable.
 
-## 配置文件
+## Configuration
 
-采用 TOML 格式，通过 `--config` 指定路径。完整模板见 `assets` 文件夹下的 [coconut-leaf.template.toml](../assets/coconut-leaf.template.toml)。
+Uses TOML format, specified via `-config` parameter.
+See the full template at [coconut-leaf.template.toml](../assets/coconut-leaf.template.toml) in the `assets` directory.
 
-字段说明：
+## Command-line Arguments
 
-| 字段 | 含义 |
+| Argument | Description |
 | --- | --- |
-| `database.driver` | `"sqlite"` 或 `"mysql"` |
+| `-config <PATH>` | **Required**, path to the TOML configuration file |
-| `database.config.path` | SQLite 数据库文件路径 |
+| `-init` | Initialize the system: create tables and the first admin user |
-| `database.config.{host,port,user,password,database}` | MySQL 连接参数（未实现） |
+| `-username <NAME>` | Used with `-init`, the initial admin username |
-| `web.port` | HTTP 监听端口 |
+| `-password <PASS>` | Used with `-init`, the initial admin password |
-| `others.debug` | 调试模式（生产环境请务必设置为false） |
-| `others.auto-token-clean-duration` | 过期 token 自动清理间隔（秒） |
 
-## 命令行参数
+`-username` / `-password` are required only when `-init` is specified and are validated 
+(username: `[0-9A-Za-z]+`, password: all visible ASCII characters, i.e., `[!-~]+`).
 
-| 参数 | 说明 |
+## Initialization and Runtime
-| --- | --- |
-| `--config <PATH>` | **必填**，配置文件（TOML）路径 |
-| `--init` | 初始化系统：建表并创建首个管理员用户 |
-| `--username <NAME>` | 与 `--init` 配合，初始管理员的用户名 |
-| `--password <PASS>` | 与 `--init` 配合，初始管理员的密码 |
 
-`--username` / `--password` 仅在 `--init` 时必填，并会做格式校验（用户名为 `[0-9A-Za-z]+`，密码为所有可见 ASCII 字符，即 `[!-~]+`）。
+### First Deployment
 
-## 初始化与运行
+First deployment includes creating tables and the admin user, then running as usual:
-
-### 首次部署
-
-首次部署包括：建表 + 创建管理员，随后如日常运行一般：
 
 ```sh
 ./coconut-leaf --config coconut-leaf.toml --init --username admin --password "your-password"
 ```
 
-### 日常运行
+### Normal Runtime
 
 ```sh
 ./coconut-leaf --config coconut-leaf.toml
 ```
 
-启动后会在 `web.port` 监听。调试日志会输出到 stderr，格式为 `[<时间>] [<级别>] <消息> [key=value ...]`。
+After starting, it listens on `web.port`. 
+Debug logs are written to stderr in the format `[<time>] [<level>] <message> [key=value ...]`.

backend/cli/cli.go

@@ -13,14 +13,14 @@ type CLIArgs struct {
 	Config string
 	// Init indicates whether to initialize the calendar system before running.
 	Init bool
-	// Username is the first admin user's name; required together with --init.
+	// Username is the first admin user's name; required together with -init.
 	Username string
-	// Password is the first admin user's password; required together with --init.
+	// Password is the first admin user's password; required together with -init.
 	Password string
 }
 
 // Parse parses the command-line arguments via the standard flag package and
-// returns a *CLIArgs. When the required --config flag is missing, it prints the
+// returns a *CLIArgs. When the required -config flag is missing, it prints the
 // usage and exits with status 2 (matching argparse's exit code).
 func Parse() *CLIArgs {
 	args := &CLIArgs{}
@@ -34,19 +34,19 @@ func Parse() *CLIArgs {
 		flag.PrintDefaults()
 	}
 
-	// --config maps to the legacy -c/--config (required), --init to -i/--init.
+	// -config maps to the legacy -c/--config (required), -init to -i/--init.
-	// --username/--password replace the legacy interactive GetUsernamePassword
+	// -username/-password replace the legacy interactive GetUsernamePassword
 	// prompt and are required together with --init.
 	flag.StringVar(&args.Config, "config", "", "The configuration file `CONFIG_TOML` for coconut-leaf")
 	flag.BoolVar(&args.Init, "init", false, "Set for initialize the calendar system")
-	flag.StringVar(&args.Username, "username", "", "The first admin user's name (required with --init)")
+	flag.StringVar(&args.Username, "username", "", "The first admin user's name (required with -init)")
-	flag.StringVar(&args.Password, "password", "", "The first admin user's password (required with --init)")
+	flag.StringVar(&args.Password, "password", "", "The first admin user's password (required with -init)")
 
 	flag.Parse()
 
 	// The standard flag package has no built-in "required", so validate manually.
 	if args.Config == "" {
-		fmt.Fprintln(os.Stderr, "error: the required flag --config is not provided")
+		fmt.Fprintln(os.Stderr, "error: the required flag -config is not provided")
 		flag.Usage()
 		os.Exit(2)
 	}