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/commands/update.rs

@@ -1,6 +1,6 @@
 use anyhow::Result;
 use serde_json::{Map, Value, json};
-use sqlx::{FromRow, PgPool};
+use sqlx::PgPool;
 use uuid::Uuid;
 
 use super::add::{
@@ -9,15 +9,8 @@ use super::add::{
 };
 use crate::crypto;
 use crate::db;
-use crate::output::OutputMode;
-
-#[derive(FromRow)]
-struct EntryRow {
-    id: Uuid,
-    version: i64,
-    tags: Vec<String>,
-    metadata: Value,
-}
+use crate::models::EntryRow;
+use crate::output::{OutputMode, print_json};
 
 pub struct UpdateArgs<'a> {
     pub namespace: &'a str,
@@ -284,11 +277,8 @@ pub async fn run(pool: &PgPool, args: UpdateArgs<'_>, master_key: &[u8; 32]) ->
     });
 
     match args.output {
-        OutputMode::Json => {
-            println!("{}", serde_json::to_string_pretty(&result_json)?);
-        }
-        OutputMode::JsonCompact => {
-            println!("{}", serde_json::to_string(&result_json)?);
+        OutputMode::Json | OutputMode::JsonCompact => {
+            print_json(&result_json, &args.output)?;
         }
         _ => {
             println!("Updated: [{}/{}] {}", args.namespace, args.kind, args.name);