feat: generic branding, remove all Tianpu hardcoding (v1.3.0)

- Replace all 天普/Tianpu text with generic "智慧能源管理平台"
- Change brandName to "EMS Platform" in both zh/en locales
- Update localStorage keys from tianpu-* to ems-*
- Make login subtitle generic

New customers copying this template will get neutral branding
that they customize for their own park/brand.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/i18n/locales/zh.json

@@ -29,7 +29,7 @@
     "viewAllAlarms": "查看全部告警",
     "profile": "个人信息",
     "logout": "退出登录",
-    "brandName": "天普EMS"
+    "brandName": "EMS Platform"
   },
   "common": {
     "save": "保存",