feat(presets): add PatewayAI provider presets

Add PatewayAI as a new partner provider with support for:
- Claude Code preset (using ANTHROPIC_API_KEY field)
- Codex preset (gpt-5.5 model)
- Claude Desktop preset (proxy mode with passthrough routes)
- Icon configuration (pateway.jpg)
- i18n support (zh/en/ja) with $3 registration bonus promotion

PatewayAI provides reliable API routing services for Claude Code,
Codex, and Gemini models.

src/i18n/locales/en.json

@@ -835,6 +835,7 @@
     "getApiKey": "Get API Key",
     "partnerPromotion": {
       "packycode": "PackyCode is an official partner of CC Switch. Register using this link and enter \"cc-switch\" promo code during recharge to get 10% off",
+      "patewayai": "PatewayAI offers special benefits for CC Switch users. Register via this link to receive $3 credit.",
       "minimax_cn": "MiniMax Coding Plan Special Offer, Starter from ¥9.9",
       "minimax_en": "MiniMax Coding Plan Black Friday, Starter is now $2/mo (80% OFF!)",
       "dmxapi": "Claude Code exclusive model 66% OFF now!",

src/i18n/locales/ja.json

@@ -835,6 +835,7 @@
     "getApiKey": "API Key を取得",
     "partnerPromotion": {
       "packycode": "PackyCode は CC Switch の公式パートナーです。登録後チャージ時に \"cc-switch\" を入力すると 10% オフ",
+      "patewayai": "PatewayAI は CC Switch ユーザーに特別な特典を提供しています。このリンクから登録すると $3 のクレジットがもらえます。",
       "minimax_cn": "MiniMax Coding Plan 特別価格、Starter ¥9.9 から",
       "minimax_en": "MiniMax Coding Plan Black Friday、Starter が月額 $2（80% OFF）",
       "dmxapi": "Claude Code 専用モデル 66% OFF 実施中！",

src/i18n/locales/zh.json

@@ -835,6 +835,7 @@
     "getApiKey": "获取 API Key",
     "partnerPromotion": {
       "packycode": "PackyCode 是 CC Switch 的官方合作伙伴，使用此链接注册并在充值时填写 \"cc-switch\" 优惠码，可以享受9折优惠",
+      "patewayai": "PatewayAI 为 CC Switch 的用户提供了特别福利，通过此链接注册可以获得3美元额度。",
       "minimax_cn": "MiniMax Coding Plan 特惠，Starter 套餐 9.9 元起",
       "minimax_en": "MiniMax Coding Plan 黑五特惠，Starter 套餐现仅 $2/月（2折优惠！）",
       "dmxapi": "Claude Code 专属模型 3.4 折优惠进行中！",