refactor: 消除冗余、统一设计，bump 0.9.1

- 提取 EntryRow/SecretFieldRow 到 models.rs
- 提取 current_actor()、print_json() 公共函数
- ExportFormat::from_extension 复用 from_str
- fetch_entries 默认 limit 100k（export/inject/run 不再截断）
- history 独立为 history.rs 模块
- delete 改用 DeleteArgs 结构体
- config_dir 改为 Result，Argon2id 参数提取常量
- Cargo 依赖 ^ 前缀、tokio 精简 features
- 更新 AGENTS.md 项目结构

Made-with: Cursor

src/main.rs

@@ -639,7 +639,16 @@ async fn main() -> Result<()> {
             let _span =
                 tracing::info_span!("cmd", command = "delete", %namespace, %kind, %name).entered();
             let out = resolve_output_mode(output.as_deref())?;
-            commands::delete::run(&pool, &namespace, &kind, &name, out).await?;
+            commands::delete::run(
+                &pool,
+                commands::delete::DeleteArgs {
+                    namespace: &namespace,
+                    kind: &kind,
+                    name: &name,
+                    output: out,
+                },
+            )
+            .await?;
         }
 
         Commands::Update {
@@ -685,7 +694,17 @@ async fn main() -> Result<()> {
             output,
         } => {
             let out = resolve_output_mode(output.as_deref())?;
-            commands::rollback::list_history(&pool, &namespace, &kind, &name, limit, out).await?;
+            commands::history::run(
+                &pool,
+                commands::history::HistoryArgs {
+                    namespace: &namespace,
+                    kind: &kind,
+                    name: &name,
+                    limit,
+                    output: out,
+                },
+            )
+            .await?;
         }
 
         Commands::Rollback {