feat: add partner promotion feature for Zhipu GLM

- Add isPartner and partnerPromotionKey fields to Provider and ProviderPreset types
- Display gold star badge on partner presets in selector
- Show promotional message in API Key section for partners
- Configure Zhipu GLM as official partner with 10% discount promotion
- Support both Claude and Codex provider presets
- Add i18n support for partner promotion messages (zh/en)

src/i18n/locales/en.json

@@ -238,6 +238,9 @@
     "customApiKeyHint": "💡 Custom configuration requires manually filling all necessary fields",
     "officialHint": "💡 Official provider uses browser login, no API Key needed",
     "getApiKey": "Get API Key",
+    "partnerPromotion": {
+      "zhipu": "Zhipu GLM is an official partner of CC Switch. Use this link to top up and get a 10% discount"
+    },
     "parameterConfig": "Parameter Config - {{name}} *",
     "mainModel": "Main Model (optional)",
     "mainModelPlaceholder": "e.g., GLM-4.6",