Feat/pricing config enhancement (#781)

* feat(db): add pricing config fields to proxy_config table

- Add default_cost_multiplier field per app type
- Add pricing_model_source field (request/response)
- Add request_model field to proxy_request_logs table
- Implement schema migration v5

* 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

* fix(proxy): apply cost multiplier to total cost only

- Move multiplier calculation from per-item to total cost
- Add resolve_pricing_config for provider-level override
- Include request_model and cost_multiplier in usage logs
- Return new fields in get_request_logs API

* feat(ui): add pricing config UI and usage log enhancements

- Add pricing config section to provider advanced settings
- Refactor PricingConfigPanel to compact table layout
- Display all three apps (Claude/Codex/Gemini) in one view
- Add multiplier column and request model display to logs
- Add frontend API wrappers for pricing config

* feat(i18n): add pricing config translations

- Add zh/en/ja translations for pricing defaults config
- Add translations for multiplier, requestModel, responseModel
- Add provider pricing config translations

* fix(pricing): align backfill cost calculation with real-time logic

- Fix backfill to deduct cache_read_tokens from input (avoid double billing)
- Apply multiplier only to total cost, not to each item
- Add multiplier display in request detail panel with i18n support
- Use AppError::localized for backend error messages
- Fix init_proxy_config_rows to use per-app default values
- Fix silent failure in set_default_cost_multiplier/set_pricing_model_source
- Add clippy allow annotation for test mutex across await

* style: format code with cargo fmt and prettier

* fix(tests): correct error type assertions in proxy DAO tests

The tests expected AppError::InvalidInput but the DAO functions use
AppError::localized() which returns AppError::Localized variant.
Updated assertions to match the correct error type with key validation.

---------

Co-authored-by: Jason <farion1231@gmail.com>

src-tauri/src/database/schema.rs

@@ -120,6 +120,8 @@ impl Database {
             circuit_failure_threshold INTEGER NOT NULL DEFAULT 4, circuit_success_threshold INTEGER NOT NULL DEFAULT 2,
             circuit_timeout_seconds INTEGER NOT NULL DEFAULT 60, circuit_error_rate_threshold REAL NOT NULL DEFAULT 0.6,
             circuit_min_requests INTEGER NOT NULL DEFAULT 10,
+            default_cost_multiplier TEXT NOT NULL DEFAULT '1',
+            pricing_model_source TEXT NOT NULL DEFAULT 'response',
             created_at TEXT NOT NULL DEFAULT (datetime('now')), updated_at TEXT NOT NULL DEFAULT (datetime('now'))
         )", []).map_err(|e| AppError::Database(e.to_string()))?;
 
@@ -170,6 +172,7 @@ impl Database {
         // 10. Proxy Request Logs 表
         conn.execute("CREATE TABLE IF NOT EXISTS proxy_request_logs (
             request_id TEXT PRIMARY KEY, provider_id TEXT NOT NULL, app_type TEXT NOT NULL, model TEXT NOT NULL,
+            request_model TEXT,
             input_tokens INTEGER NOT NULL DEFAULT 0, output_tokens INTEGER NOT NULL DEFAULT 0,
             cache_read_tokens INTEGER NOT NULL DEFAULT 0, cache_creation_tokens INTEGER NOT NULL DEFAULT 0,
             input_cost_usd TEXT NOT NULL DEFAULT '0', output_cost_usd TEXT NOT NULL DEFAULT '0',
@@ -352,6 +355,11 @@ impl Database {
                         Self::migrate_v3_to_v4(conn)?;
                         Self::set_user_version(conn, 4)?;
                     }
+                    4 => {
+                        log::info!("迁移数据库从 v4 到 v5（计费模式支持）");
+                        Self::migrate_v4_to_v5(conn)?;
+                        Self::set_user_version(conn, 5)?;
+                    }
                     _ => {
                         return Err(AppError::Database(format!(
                             "未知的数据库版本 {version}，无法迁移到 {SCHEMA_VERSION}"
@@ -521,6 +529,7 @@ impl Database {
         // proxy_request_logs 表
         conn.execute("CREATE TABLE IF NOT EXISTS proxy_request_logs (
             request_id TEXT PRIMARY KEY, provider_id TEXT NOT NULL, app_type TEXT NOT NULL, model TEXT NOT NULL,
+            request_model TEXT,
             input_tokens INTEGER NOT NULL DEFAULT 0, output_tokens INTEGER NOT NULL DEFAULT 0,
             cache_read_tokens INTEGER NOT NULL DEFAULT 0, cache_creation_tokens INTEGER NOT NULL DEFAULT 0,
             input_cost_usd TEXT NOT NULL DEFAULT '0', output_cost_usd TEXT NOT NULL DEFAULT '0',
@@ -677,6 +686,8 @@ impl Database {
             circuit_failure_threshold INTEGER NOT NULL DEFAULT 4, circuit_success_threshold INTEGER NOT NULL DEFAULT 2,
             circuit_timeout_seconds INTEGER NOT NULL DEFAULT 60, circuit_error_rate_threshold REAL NOT NULL DEFAULT 0.6,
             circuit_min_requests INTEGER NOT NULL DEFAULT 10,
+            default_cost_multiplier TEXT NOT NULL DEFAULT '1',
+            pricing_model_source TEXT NOT NULL DEFAULT 'response',
             created_at TEXT NOT NULL DEFAULT (datetime('now')), updated_at TEXT NOT NULL DEFAULT (datetime('now'))
         )", [])?;
 
@@ -879,6 +890,30 @@ impl Database {
         Ok(())
     }
 
+    /// v4 -> v5 迁移：新增计费模式配置与请求模型字段
+    fn migrate_v4_to_v5(conn: &Connection) -> Result<(), AppError> {
+        if Self::table_exists(conn, "proxy_config")? {
+            Self::add_column_if_missing(
+                conn,
+                "proxy_config",
+                "default_cost_multiplier",
+                "TEXT NOT NULL DEFAULT '1'",
+            )?;
+            Self::add_column_if_missing(
+                conn,
+                "proxy_config",
+                "pricing_model_source",
+                "TEXT NOT NULL DEFAULT 'response'",
+            )?;
+        }
+        if Self::table_exists(conn, "proxy_request_logs")? {
+            Self::add_column_if_missing(conn, "proxy_request_logs", "request_model", "TEXT")?;
+        }
+
+        log::info!("v4 -> v5 迁移完成：已添加计费模式与请求模型字段");
+        Ok(())
+    }
+
     /// 插入默认模型定价数据
     /// 格式: (model_id, display_name, input, output, cache_read, cache_creation)
     /// 注意: model_id 使用短横线格式（如 claude-haiku-4-5），与 API 返回的模型名称标准化后一致