feat: add Longcat provider and update GLM model version

- Add Longcat provider preset with Flash-Chat model configuration
- Update mainModelPlaceholder from GLM-4.5 to GLM-4.6 in i18n files
- Configure Longcat with max output tokens (6000) and disabled non-essential traffic

src/config/providerPresets.ts

@@ -127,6 +127,24 @@ export const providerPresets: ProviderPreset[] = [
       },
     },
   },
+  {
+    name: "Longcat",
+    websiteUrl: "https://longcat.chat/platform",
+    apiKeyUrl: "https://longcat.chat/platform/api_keys",
+    settingsConfig: {
+      env: {
+        ANTHROPIC_BASE_URL: "https://api.longcat.chat/anthropic",
+        ANTHROPIC_AUTH_TOKEN: "",
+        ANTHROPIC_MODEL: "LongCat-Flash-Chat",
+        ANTHROPIC_SMALL_FAST_MODEL: "LongCat-Flash-Chat",
+        ANTHROPIC_DEFAULT_SONNET_MODEL: "LongCat-Flash-Chat",
+        ANTHROPIC_DEFAULT_OPUS_MODEL: "LongCat-Flash-Chat",
+        CLAUDE_CODE_MAX_OUTPUT_TOKENS: "6000",
+        CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: 1
+      },
+    },
+    category: "cn_official",
+  },
   {
     name: "PackyCode",
     websiteUrl: "https://www.packycode.com",