feat(api): add pricing config commands and provider meta fields

- Add get/set commands for default cost multiplier
- Add get/set commands for pricing model source
- Extend ProviderMeta with cost_multiplier and pricing_model_source
- Register new commands in Tauri invoke handler

src-tauri/src/commands/proxy.rs

@@ -2,6 +2,7 @@
 //!
 //! 提供前端调用的 API 接口
 
+use crate::error::AppError;
 use crate::proxy::types::*;
 use crate::proxy::{CircuitBreakerConfig, CircuitBreakerStats};
 use crate::store::AppState;
@@ -119,6 +120,120 @@ pub async fn update_proxy_config_for_app(
         .map_err(|e| e.to_string())
 }
 
+async fn get_default_cost_multiplier_internal(
+    state: &AppState,
+    app_type: &str,
+) -> Result<String, AppError> {
+    let db = &state.db;
+    db.get_default_cost_multiplier(app_type).await
+}
+
+#[cfg_attr(not(feature = "test-hooks"), doc(hidden))]
+pub async fn get_default_cost_multiplier_test_hook(
+    state: &AppState,
+    app_type: &str,
+) -> Result<String, AppError> {
+    get_default_cost_multiplier_internal(state, app_type).await
+}
+
+/// 获取默认成本倍率
+#[tauri::command]
+pub async fn get_default_cost_multiplier(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+) -> Result<String, String> {
+    get_default_cost_multiplier_internal(&state, &app_type)
+        .await
+        .map_err(|e| e.to_string())
+}
+
+async fn set_default_cost_multiplier_internal(
+    state: &AppState,
+    app_type: &str,
+    value: &str,
+) -> Result<(), AppError> {
+    let db = &state.db;
+    db.set_default_cost_multiplier(app_type, value).await
+}
+
+#[cfg_attr(not(feature = "test-hooks"), doc(hidden))]
+pub async fn set_default_cost_multiplier_test_hook(
+    state: &AppState,
+    app_type: &str,
+    value: &str,
+) -> Result<(), AppError> {
+    set_default_cost_multiplier_internal(state, app_type, value).await
+}
+
+/// 设置默认成本倍率
+#[tauri::command]
+pub async fn set_default_cost_multiplier(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    value: String,
+) -> Result<(), String> {
+    set_default_cost_multiplier_internal(&state, &app_type, &value)
+        .await
+        .map_err(|e| e.to_string())
+}
+
+async fn get_pricing_model_source_internal(
+    state: &AppState,
+    app_type: &str,
+) -> Result<String, AppError> {
+    let db = &state.db;
+    db.get_pricing_model_source(app_type).await
+}
+
+#[cfg_attr(not(feature = "test-hooks"), doc(hidden))]
+pub async fn get_pricing_model_source_test_hook(
+    state: &AppState,
+    app_type: &str,
+) -> Result<String, AppError> {
+    get_pricing_model_source_internal(state, app_type).await
+}
+
+/// 获取计费模式来源
+#[tauri::command]
+pub async fn get_pricing_model_source(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+) -> Result<String, String> {
+    get_pricing_model_source_internal(&state, &app_type)
+        .await
+        .map_err(|e| e.to_string())
+}
+
+async fn set_pricing_model_source_internal(
+    state: &AppState,
+    app_type: &str,
+    value: &str,
+) -> Result<(), AppError> {
+    let db = &state.db;
+    db.set_pricing_model_source(app_type, value).await
+}
+
+#[cfg_attr(not(feature = "test-hooks"), doc(hidden))]
+pub async fn set_pricing_model_source_test_hook(
+    state: &AppState,
+    app_type: &str,
+    value: &str,
+) -> Result<(), AppError> {
+    set_pricing_model_source_internal(state, app_type, value).await
+}
+
+/// 设置计费模式来源
+#[tauri::command]
+pub async fn set_pricing_model_source(
+    state: tauri::State<'_, AppState>,
+    app_type: String,
+    value: String,
+) -> Result<(), String> {
+    set_pricing_model_source_internal(&state, &app_type, &value)
+        .await
+        .map_err(|e| e.to_string())
+}
+
 /// 检查代理服务器是否正在运行
 #[tauri::command]
 pub async fn is_proxy_running(state: tauri::State<'_, AppState>) -> Result<bool, String> {