chore: add CODEOWNERS for two-team development structure

Team A (core-platform): backend/, scripts/, docker, nginx
Team B (delivery-app): frontend/
Shared: API contract files require both team review

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

CODEOWNERS

@@ -0,0 +1,36 @@
+# ============================================================
+# 天普EMS 代码归属 (Code Ownership)
+# ============================================================
+# Team A (核心平台组 Core Platform): 后端、数据库、IoT采集
+# Team B (交付应用组 Delivery & App): 前端、客户交付、现场部署
+# ============================================================
+
+# ---- Team A: 核心平台组 ----
+/backend/                     @core-platform
+/backend/app/api/             @core-platform
+/backend/app/collectors/      @core-platform
+/backend/app/core/            @core-platform
+/backend/app/models/          @core-platform
+/backend/app/services/        @core-platform
+/backend/app/tasks/           @core-platform
+/backend/app/templates/       @core-platform
+/backend/alembic/             @core-platform
+/backend/tests/               @core-platform
+/scripts/seed_data.py         @core-platform
+/scripts/backfill_data.py     @core-platform
+/scripts/init_db.py           @core-platform
+
+# ---- Team B: 交付应用组 ----
+/frontend/                    @delivery-app
+/frontend/src/                @delivery-app
+/frontend/public/             @delivery-app
+
+# ---- Shared: API contract (breaking changes need both teams) ----
+/backend/app/api/v1/          @core-platform @delivery-app
+/frontend/src/services/api.ts @delivery-app @core-platform
+
+# ---- Infrastructure (Team A writes, Team B validates) ----
+/docker-compose*.yml          @core-platform
+/nginx/                       @core-platform
+/scripts/quick-start.sh       @core-platform
+/.env.example                 @core-platform