v0.6.3: 添加默认供应商支持

- 新增 StepFun Plan 套餐预设
- 供应商编辑页 API Key 下方添加获取 Key 链接（支持推广链接）
- 修复链接无法打开浏览器的问题（Rust open_external_url）
- 无推广链接时回退打开官网
- 必填字段（供应商名称/API Key/请求地址）添加红色 * 标注
- 用户自定义预设方案文档

src/components/ProviderEdit.tsx

@@ -3,6 +3,7 @@ import { createPortal } from "react-dom";
 import { invoke } from "@tauri-apps/api/core";
 import { useTranslation } from "../i18n";
 import type { TranslationKey } from "../i18n/zh";
+import { findPresetForProvider } from "../config/providerPresets";
 import { getDefaultMaxContextSize } from "../lib/model-defaults";
 import { capabilitiesFromRef, getModelRef } from "../lib/models-dev";
 import { getIconMetadata } from "../icons/extracted/metadata";
@@ -117,6 +118,10 @@ export function ProviderEdit({
   const [showApiKey, setShowApiKey] = useState(false);
   const [showIconPicker, setShowIconPicker] = useState(false);
 
+  // Preset this provider was created from (if any) — provides the
+  // "Get API Key" / referral links shown under the key input.
+  const preset = findPresetForProvider(provider);
+
   useEffect(() => {
     const def = defaultBaseUrl(agent, provider.provider_type);
     if (!def) return;
@@ -215,7 +220,7 @@ export function ProviderEdit({
               <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
                 <div>
                   <label htmlFor={nameId} className="block text-sm text-content-muted mb-1.5">
-                    {t("providerName")}
+                    {t("providerName")} <span className="text-red-500">*</span>
                   </label>
                   <input
                     id={nameId}
@@ -296,7 +301,7 @@ export function ProviderEdit({
                 {!provider.managed && (
                   <div>
                     <label htmlFor={apiKeyId} className="block text-sm text-content-muted mb-1.5">
-                      {t("apiKey")}
+                      {t("apiKey")} <span className="text-red-500">*</span>
                     </label>
                     <div className="relative">
                       <input
@@ -316,12 +321,29 @@ export function ProviderEdit({
                         {showApiKey ? t("hide") : t("show")}
                       </button>
                     </div>
+                    {(() => {
+                      const linkUrl = preset?.apiKeyUrl ?? provider.official_url ?? null;
+                      if (!linkUrl) return null;
+                      return (
+                        <div className="mt-1.5 flex items-center gap-4 text-xs">
+                          <button
+                            type="button"
+                            onClick={() =>
+                              invoke("open_external_url", { url: linkUrl }).catch(() => {})
+                            }
+                            className="text-blue-600 dark:text-blue-400 hover:underline"
+                          >
+                            {preset?.apiKeyUrl ? t("getApiKeyLink") : t("officialUrl")}
+                          </button>
+                        </div>
+                      );
+                    })()}
                   </div>
                 )}
 
                 <div>
                   <label htmlFor={baseUrlId} className="block text-sm text-content-muted mb-1.5">
-                    {t("requestUrl")}
+                    {t("requestUrl")} <span className="text-red-500">*</span>
                   </label>
                   <input
                     id={baseUrlId}