feat(sub): add Incy client integration and routing tab

Add an Incy quick-import button (incy://add) to the Android and iOS app menus on the subscription page, and a new Incy settings tab with routing enable + rules. Incy routing is delivered by injecting an incy://routing/onadd line into the raw subscription body, avoiding a collision with Happ's Routing header. Includes backend settings, regenerated OpenAPI/zod schemas, and translations for all locales.

internal/web/translation/zh-CN.json

@@ -1130,6 +1130,10 @@
       "subRoutingRulesDesc": "VPN 用户端的全域路由规则。（仅限 Happ）",
       "subHideSettings": "隐藏服务器设置",
       "subHideSettingsDesc": "在 VPN 客户端中隐藏查看和编辑服务器配置的功能。（仅限 Happ）",
+      "subIncyEnableRouting": "启用路由",
+      "subIncyEnableRoutingDesc": "为 Incy 客户端将路由配置注入订阅内容中。（仅限 Incy）",
+      "subIncyRoutingRules": "路由规则",
+      "subIncyRoutingRulesDesc": "添加到订阅内容的 Incy 路由深层链接，例如 incy://routing/onadd/<base64>。（仅限 Incy）",
       "subClashEnableRouting": "启用路由",
       "subClashEnableRoutingDesc": "在生成的 YAML 订阅中包含 Clash/Mihomo 全局路由规则。",
       "subClashRoutingRules": "全局路由规则",