chore(secrets-mcp): 0.5.1 — 移除 entry type 归一化，MCP 参数兼容字符串形式

- 去掉 taxonomy 对 entry type 的自动映射与 metadata.subtype 回填；仅 trim 后入库
- MCP tools：Vec/Map/bool 等可选字段支持 JSON 内嵌字符串解析，并改进解析失败提示
- 新增 deser 单元测试；README/AGENTS 与 models 注释同步

Made-with: Cursor

crates/secrets-core/src/service/update.rs

@@ -11,7 +11,6 @@ use crate::service::add::{
     collect_field_paths, collect_key_paths, flatten_json_fields, insert_path, parse_key_path,
     parse_kv, remove_path,
 };
-use crate::taxonomy;
 
 #[derive(Debug, serde::Serialize)]
 pub struct UpdateResult {
@@ -501,13 +500,7 @@ pub async fn update_fields_by_id(
         tracing::warn!(error = %e, "failed to snapshot entry history before web update");
     }
 
-    let mut metadata_map = match params.metadata {
-        Value::Object(m) => m.clone(),
-        _ => Map::new(),
-    };
-    let normalized_type =
-        taxonomy::normalize_entry_type_and_metadata(params.entry_type, &mut metadata_map);
-    let normalized_metadata = Value::Object(metadata_map);
+    let entry_type = params.entry_type.trim();
 
     let res = sqlx::query(
         "UPDATE entries SET folder = $1, type = $2, name = $3, notes = $4, tags = $5, metadata = $6, \
@@ -515,11 +508,11 @@ pub async fn update_fields_by_id(
          WHERE id = $7 AND version = $8",
     )
     .bind(params.folder)
-    .bind(&normalized_type)
+    .bind(entry_type)
     .bind(params.name)
     .bind(params.notes)
     .bind(params.tags)
-    .bind(&normalized_metadata)
+    .bind(params.metadata)
     .bind(row.id)
     .bind(row.version)
     .execute(&mut *tx)
@@ -546,7 +539,7 @@ pub async fn update_fields_by_id(
         Some(user_id),
         "update",
         params.folder,
-        &normalized_type,
+        entry_type,
         params.name,
         serde_json::json!({
             "source": "web",