feat(providers): rebrand CTok to ETok across presets, icons, and docs

The vendor renamed its domain, API endpoints, and trademark from CTok to
ETok. Update all user-facing branding accordingly:

- Presets (claude, claude-desktop, codex, gemini, hermes, openclaw,
  opencode): ctok.ai -> etok.ai, api.ctok.ai -> api.etok.ai, internal
  provider id ctok -> etok, display name CTok.ai -> ETok.ai
- Icons: replace inline placeholder SVG with the new ETok brand PNG,
  moved from `icons` to `iconUrls`; key ctok -> etok; banner logo
  ctok.png -> etok.png
- README (en/zh/ja/de) partner banner: new logo, links, and copy
- i18n (en/ja/zh/zh-TW): partnerPromotion key ctok -> etok

Keep "ctok" in the Codex history-migration whitelist as a legacy id and
add "etok", so existing users' local session history stays correctly
bucketed after the rename.

src/config/opencodeProviderPresets.ts

@@ -1654,14 +1654,14 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
     },
   },
   {
-    name: "CTok.ai",
-    websiteUrl: "https://ctok.ai",
-    apiKeyUrl: "https://ctok.ai",
+    name: "ETok.ai",
+    websiteUrl: "https://etok.ai",
+    apiKeyUrl: "https://etok.ai",
     settingsConfig: {
       npm: "@ai-sdk/anthropic",
-      name: "CTok",
+      name: "ETok",
       options: {
-        baseURL: "https://api.ctok.ai/v1",
+        baseURL: "https://api.etok.ai/v1",
         apiKey: "",
         setCacheKey: true,
       },
@@ -1672,8 +1672,8 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
     },
     category: "third_party",
     isPartner: true,
-    partnerPromotionKey: "ctok",
-    icon: "ctok",
+    partnerPromotionKey: "etok",
+    icon: "etok",
     iconColor: "#000000",
     templateValues: {
       apiKey: {