feat: add Micu API as sponsor and update affiliate links

Add Micu (米醋API) sponsor entry to all three README files (EN/ZH/JA)
with logo and description. Update apiKeyUrl for Micu provider presets
across claude, codex, opencode, and openclaw to use affiliate
registration link.

src/config/claudeProviderPresets.ts

@@ -595,7 +595,7 @@ export const providerPresets: ProviderPreset[] = [
   {
     name: "Micu",
     websiteUrl: "https://www.openclaudecode.cn",
-    apiKeyUrl: "https://www.openclaudecode.cn",
+    apiKeyUrl: "https://www.openclaudecode.cn/register?aff=aOYQ",
     settingsConfig: {
       env: {
         ANTHROPIC_BASE_URL: "https://www.openclaudecode.cn",

src/config/codexProviderPresets.ts

@@ -303,7 +303,7 @@ requires_openai_auth = true`,
   {
     name: "Micu",
     websiteUrl: "https://www.openclaudecode.cn",
-    apiKeyUrl: "https://www.openclaudecode.cn/v1",
+    apiKeyUrl: "https://www.openclaudecode.cn/register?aff=aOYQ",
     auth: generateThirdPartyAuth(""),
     config: generateThirdPartyConfig(
       "micu",

src/config/openclawProviderPresets.ts

@@ -1307,7 +1307,7 @@ export const openclawProviderPresets: OpenClawProviderPreset[] = [
   {
     name: "Micu",
     websiteUrl: "https://www.openclaudecode.cn",
-    apiKeyUrl: "https://www.openclaudecode.cn",
+    apiKeyUrl: "https://www.openclaudecode.cn/register?aff=aOYQ",
     settingsConfig: {
       baseUrl: "https://www.openclaudecode.cn",
       apiKey: "",

src/config/opencodeProviderPresets.ts

@@ -1120,7 +1120,7 @@ export const opencodeProviderPresets: OpenCodeProviderPreset[] = [
   {
     name: "Micu",
     websiteUrl: "https://www.openclaudecode.cn",
-    apiKeyUrl: "https://www.openclaudecode.cn/v1",
+    apiKeyUrl: "https://www.openclaudecode.cn/register?aff=aOYQ",
     settingsConfig: {
       npm: "@ai-sdk/anthropic",
       name: "Micu",