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/components/providers/forms/ProviderAdvancedConfig.tsx

@@ -5,6 +5,7 @@ import {
   ChevronRight,
   FlaskConical,
   Globe,
+  Coins,
   Eye,
   EyeOff,
   X,
@@ -13,14 +14,31 @@ import { Input } from "@/components/ui/input";
 import { Label } from "@/components/ui/label";
 import { Switch } from "@/components/ui/switch";
 import { Button } from "@/components/ui/button";
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/components/ui/select";
 import { cn } from "@/lib/utils";
 import type { ProviderTestConfig, ProviderProxyConfig } from "@/types";
 
+export type PricingModelSourceOption = "inherit" | "request" | "response";
+
+interface ProviderPricingConfig {
+  enabled: boolean;
+  costMultiplier?: string;
+  pricingModelSource: PricingModelSourceOption;
+}
+
 interface ProviderAdvancedConfigProps {
   testConfig: ProviderTestConfig;
   proxyConfig: ProviderProxyConfig;
+  pricingConfig: ProviderPricingConfig;
   onTestConfigChange: (config: ProviderTestConfig) => void;
   onProxyConfigChange: (config: ProviderProxyConfig) => void;
+  onPricingConfigChange: (config: ProviderPricingConfig) => void;
 }
 
 /** 从 ProviderProxyConfig 构建完整 URL */
@@ -71,14 +89,19 @@ function parseProxyUrl(url: string): Partial<ProviderProxyConfig> {
 export function ProviderAdvancedConfig({
   testConfig,
   proxyConfig,
+  pricingConfig,
   onTestConfigChange,
   onProxyConfigChange,
+  onPricingConfigChange,
 }: ProviderAdvancedConfigProps) {
   const { t } = useTranslation();
   const [isTestConfigOpen, setIsTestConfigOpen] = useState(testConfig.enabled);
   const [isProxyConfigOpen, setIsProxyConfigOpen] = useState(
     proxyConfig.enabled,
   );
+  const [isPricingConfigOpen, setIsPricingConfigOpen] = useState(
+    pricingConfig.enabled,
+  );
   const [showPassword, setShowPassword] = useState(false);
 
   // 代理 URL 输入状态（仅在初始化时从 proxyConfig 构建）
@@ -97,6 +120,11 @@ export function ProviderAdvancedConfig({
     setIsProxyConfigOpen(proxyConfig.enabled);
   }, [proxyConfig.enabled]);
 
+  // 同步外部 pricingConfig.enabled 变化到展开状态
+  useEffect(() => {
+    setIsPricingConfigOpen(pricingConfig.enabled);
+  }, [pricingConfig.enabled]);
+
   // 仅在外部 proxyConfig 变化且非用户输入时同步（如：重置表单、加载数据）
   useEffect(() => {
     if (!isUserTyping) {
@@ -450,6 +478,143 @@ export function ProviderAdvancedConfig({
           </div>
         </div>
       </div>
+
+      {/* 计费配置 */}
+      <div className="rounded-lg border border-border/50 bg-muted/20">
+        <button
+          type="button"
+          className="flex w-full items-center justify-between p-4 hover:bg-muted/30 transition-colors"
+          onClick={() => setIsPricingConfigOpen(!isPricingConfigOpen)}
+        >
+          <div className="flex items-center gap-3">
+            <Coins className="h-4 w-4 text-muted-foreground" />
+            <span className="font-medium">
+              {t("providerAdvanced.pricingConfig", {
+                defaultValue: "计费配置",
+              })}
+            </span>
+          </div>
+          <div className="flex items-center gap-3">
+            <div
+              className="flex items-center gap-2"
+              onClick={(e) => e.stopPropagation()}
+            >
+              <Label
+                htmlFor="pricing-config-enabled"
+                className="text-sm text-muted-foreground"
+              >
+                {t("providerAdvanced.useCustomPricing", {
+                  defaultValue: "使用单独配置",
+                })}
+              </Label>
+              <Switch
+                id="pricing-config-enabled"
+                checked={pricingConfig.enabled}
+                onCheckedChange={(checked) => {
+                  onPricingConfigChange({ ...pricingConfig, enabled: checked });
+                  if (checked) setIsPricingConfigOpen(true);
+                }}
+              />
+            </div>
+            {isPricingConfigOpen ? (
+              <ChevronDown className="h-4 w-4 text-muted-foreground" />
+            ) : (
+              <ChevronRight className="h-4 w-4 text-muted-foreground" />
+            )}
+          </div>
+        </button>
+        <div
+          className={cn(
+            "overflow-hidden transition-all duration-200",
+            isPricingConfigOpen
+              ? "max-h-[500px] opacity-100"
+              : "max-h-0 opacity-0",
+          )}
+        >
+          <div className="border-t border-border/50 p-4 space-y-4">
+            <p className="text-sm text-muted-foreground">
+              {t("providerAdvanced.pricingConfigDesc", {
+                defaultValue:
+                  "为此供应商配置单独的计费参数，不启用时使用全局默认配置。",
+              })}
+            </p>
+            <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
+              <div className="space-y-2">
+                <Label htmlFor="cost-multiplier">
+                  {t("providerAdvanced.costMultiplier", {
+                    defaultValue: "成本倍率",
+                  })}
+                </Label>
+                <Input
+                  id="cost-multiplier"
+                  type="number"
+                  step="0.01"
+                  inputMode="decimal"
+                  value={pricingConfig.costMultiplier || ""}
+                  onChange={(e) =>
+                    onPricingConfigChange({
+                      ...pricingConfig,
+                      costMultiplier: e.target.value || undefined,
+                    })
+                  }
+                  placeholder={t("providerAdvanced.costMultiplierPlaceholder", {
+                    defaultValue: "留空使用全局默认（1）",
+                  })}
+                  disabled={!pricingConfig.enabled}
+                />
+                <p className="text-xs text-muted-foreground">
+                  {t("providerAdvanced.costMultiplierHint", {
+                    defaultValue: "实际成本 = 基础成本 × 倍率，支持小数如 1.5",
+                  })}
+                </p>
+              </div>
+              <div className="space-y-2">
+                <Label htmlFor="pricing-model-source">
+                  {t("providerAdvanced.pricingModelSourceLabel", {
+                    defaultValue: "计费模式",
+                  })}
+                </Label>
+                <Select
+                  value={pricingConfig.pricingModelSource}
+                  onValueChange={(value) =>
+                    onPricingConfigChange({
+                      ...pricingConfig,
+                      pricingModelSource: value as PricingModelSourceOption,
+                    })
+                  }
+                  disabled={!pricingConfig.enabled}
+                >
+                  <SelectTrigger id="pricing-model-source">
+                    <SelectValue />
+                  </SelectTrigger>
+                  <SelectContent>
+                    <SelectItem value="inherit">
+                      {t("providerAdvanced.pricingModelSourceInherit", {
+                        defaultValue: "继承全局默认",
+                      })}
+                    </SelectItem>
+                    <SelectItem value="request">
+                      {t("providerAdvanced.pricingModelSourceRequest", {
+                        defaultValue: "请求模型",
+                      })}
+                    </SelectItem>
+                    <SelectItem value="response">
+                      {t("providerAdvanced.pricingModelSourceResponse", {
+                        defaultValue: "返回模型",
+                      })}
+                    </SelectItem>
+                  </SelectContent>
+                </Select>
+                <p className="text-xs text-muted-foreground">
+                  {t("providerAdvanced.pricingModelSourceHint", {
+                    defaultValue: "选择按请求模型还是返回模型进行定价匹配",
+                  })}
+                </p>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
     </div>
   );
 }