feat: add AICoding partner provider presets and i18n promotion text

Add AICoding as a partner provider across all five apps (Claude, Codex,
Gemini, OpenClaw, OpenCode) with endpoint, API key URL, and partner
promotion configuration. Add trilingual (zh/en/ja) promotion text for
the first top-up discount.

src/config/codexProviderPresets.ts

@@ -227,6 +227,24 @@ requires_openai_auth = true`,
     icon: "aicodemirror",
     iconColor: "#000000",
   },
+  {
+    name: "AICoding",
+    websiteUrl: "https://www.aicoding.sh",
+    apiKeyUrl: "https://www.aicoding.sh/i/CCSWITCH",
+    auth: generateThirdPartyAuth(""),
+    config: generateThirdPartyConfig(
+      "aicoding",
+      "https://api.aicoding.sh",
+      "gpt-5.3-codex",
+    ),
+    endpointCandidates: [
+      "https://api.aicoding.sh",
+    ],
+    isPartner: true,
+    partnerPromotionKey: "aicoding",
+    icon: "aicoding",
+    iconColor: "#000000",
+  },
   {
     name: "OpenRouter",
     websiteUrl: "https://openrouter.ai",