feat(admin): integrate Next.js admin panel (admin-next/) from feat/nextjs-admin

- Add admin-next/: full Next.js + Prisma + shadcn admin panel (45 API routes, 76 components)
- docker-compose: tg_shop_admin service (port 3000, shared db/shop.db, prisma), bot talks to it via ADMIN_CHAT_URL=http://tg_shop_admin:3000/api/chat
- tor-proxy now proxies onion admin to tg_shop_admin:3000 (new panel)
- chatbotService: ADMIN_CHAT_URL default = http://tg_shop_admin:3000/api/chat (removed localhost:3100 anachronism)
- .env admin secrets gitignored (admin-next/.env)

admin-next/.zscripts/database-runtime-build.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+set -euo pipefail
+
+PROJECT_DIR="${PROJECT_DIR:-/home/z/my-project}"
+BUILD_DIR="${BUILD_DIR:?BUILD_DIR is required}"
+SOURCE_DB_DIR="$PROJECT_DIR/db"
+SOURCE_DB_PATH="$SOURCE_DB_DIR/custom.db"
+TARGET_DB_DIR="$BUILD_DIR/db"
+TARGET_DB_PATH="$TARGET_DB_DIR/custom.db"
+
+mkdir -p "$TARGET_DB_DIR"
+
+if [ -f "$SOURCE_DB_PATH" ]; then
+    echo "🗄️  复制 Preview 数据库到构建产物..."
+    cp -a "$SOURCE_DB_DIR/." "$TARGET_DB_DIR/"
+else
+    echo "ℹ️  未找到 Preview 数据库 db/custom.db，将初始化空的生产数据库"
+fi
+
+echo "🗄️  同步构建产物中的数据库结构..."
+(
+    cd "$PROJECT_DIR"
+    DATABASE_URL="file:$TARGET_DB_PATH" bun run db:push
+)
+
+if [ ! -f "$TARGET_DB_PATH" ]; then
+    echo "❌ 数据库初始化命令执行成功，但未生成 $TARGET_DB_PATH"
+    exit 1
+fi
+
+echo "✅ 构建产物数据库已准备完成"
+ls -lah "$TARGET_DB_DIR"