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>

VERSIONS.json

@@ -1,7 +1,7 @@
 {
   "project": "ems-frontend-template",
-  "project_version": "1.2.0",
-  "core_version": "1.1.0",
+  "project_version": "1.3.0",
+  "core_version": "1.3.0",
   "last_updated": "2026-04-06",
-  "notes": "Base React/TypeScript UI template for customer frontends"
+  "notes": "Generic branding, removed all Tianpu-specific hardcoding"
 }