feat: delete 命令支持批量删除，--name 改为可选

省略 --name 时按 namespace（+ 可选 --kind）批量删除所有匹配记录；
支持 --dry-run 预览；删除前自动快照历史并写入审计日志。
移除独立的 delete-ns 子命令，合并为统一的 delete 入口。
更新 AGENTS.md 文档，版本 bump 至 0.9.3。

Made-with: Cursor

src/main.rs

@@ -211,23 +211,39 @@ EXAMPLES:
         output: Option<String>,
     },
 
-    /// Delete a record permanently. Requires exact namespace + kind + name.
+    /// Delete one record precisely, or bulk-delete by namespace.
+    ///
+    /// With --name: deletes exactly that record (--kind also required).
+    /// Without --name: bulk-deletes all records matching namespace + optional --kind.
+    /// Use --dry-run to preview bulk deletes before committing.
     #[command(after_help = "EXAMPLES:
-  # Delete a service credential
+  # Delete a single record (exact match)
   secrets delete -n refining --kind service --name legacy-mqtt
 
-  # Delete a server record
-  secrets delete -n ricnsmart --kind server --name i-old-server-id")]
+  # Preview what a bulk delete would remove (no writes)
+  secrets delete -n refining --dry-run
+
+  # Bulk-delete all records in a namespace
+  secrets delete -n ricnsmart
+
+  # Bulk-delete only server records in a namespace
+  secrets delete -n ricnsmart --kind server
+
+  # JSON output
+  secrets delete -n refining --kind service -o json")]
     Delete {
         /// Namespace, e.g. refining
         #[arg(short, long)]
         namespace: String,
-        /// Kind, e.g. server, service
+        /// Kind filter, e.g. server, service (required with --name; optional for bulk)
         #[arg(long)]
-        kind: String,
-        /// Exact name of the record to delete
+        kind: Option<String>,
+        /// Exact name of the record to delete (omit for bulk delete)
         #[arg(long)]
-        name: String,
+        name: Option<String>,
+        /// Preview what would be deleted without making any changes (bulk mode only)
+        #[arg(long)]
+        dry_run: bool,
         /// Output format: text (default on TTY), json, json-compact
         #[arg(short, long = "output")]
         output: Option<String>,
@@ -640,17 +656,19 @@ async fn main() -> Result<()> {
             namespace,
             kind,
             name,
+            dry_run,
             output,
         } => {
             let _span =
-                tracing::info_span!("cmd", command = "delete", %namespace, %kind, %name).entered();
+                tracing::info_span!("cmd", command = "delete", %namespace, ?kind, ?name).entered();
             let out = resolve_output_mode(output.as_deref())?;
             commands::delete::run(
                 &pool,
                 commands::delete::DeleteArgs {
                     namespace: &namespace,
-                    kind: &kind,
-                    name: &name,
+                    kind: kind.as_deref(),
+                    name: name.as_deref(),
+                    dry_run,
                     output: out,
                 },
             )