feat: add Sub2API application for AI API gateway platform

- Add Sub2API 1Panel application configuration
- Support subscription quota distribution, API Key management, billing and load balancing
- Include docker-compose.yml, data.yml, README documentation and logo
- Support amd64 and arm64 architectures

apps/sub2api/latest/data.yml

@@ -0,0 +1,33 @@
+additionalProperties:
+  formFields:
+    - default: 8080
+      edit: true
+      envKey: PANEL_APP_PORT_HTTP
+      labelEn: Web Port
+      labelZh: Web 端口
+      required: true
+      rule: paramPort
+      type: number
+    - default: Asia/Shanghai
+      edit: true
+      envKey: TZ
+      labelEn: Time Zone
+      labelZh: 时区
+      required: true
+      type: text
+    - default: sub2api_secure_jwt_secret_change_in_production
+      edit: true
+      envKey: JWT_SECRET
+      labelEn: JWT Secret
+      labelZh: JWT 密钥
+      required: true
+      rule: paramCommon
+      type: password
+    - default: sub2api_secure_db_password_change_in_production
+      edit: true
+      envKey: POSTGRES_PASSWORD
+      labelEn: PostgreSQL Password
+      labelZh: PostgreSQL 密码
+      required: true
+      rule: paramCommon
+      type: password