fix(k8s): 同步 local 模式数据路径为 /app/sqlite3.db 与二进制同级

- deployment/quick-deploy: PVC 挂载 sqlite3.db/redka.db 到 /app/，含旧 data/ 迁移
- configmap 与 run.sh 状态输出对齐新路径
- README 补充 local 模式说明

run.sh

@@ -238,7 +238,7 @@ cmd_dev() {
         info "前端地址: http://localhost:$FRONTEND_PORT"
         info "后端地址: http://localhost:$BACKEND_PORT"
         info "健康检查: http://localhost:$BACKEND_PORT/health"
-        info "数据库:   SQLite (backend/sqlite3.db)"
+        info "数据库:   SQLite (./sqlite3.db)"
         echo ""
         info "使用 './run.sh stop' 停止服务"
     else
@@ -272,9 +272,12 @@ cmd_status() {
     else
         warning "前端: 未运行"
     fi
-    if [ -f "$SCRIPT_DIR/$BACKEND_DIR/sqlite3.db" ]; then
+    if [ -f "$SCRIPT_DIR/sqlite3.db" ]; then
+        local db_size=$(du -h "$SCRIPT_DIR/sqlite3.db" | cut -f1)
+        info "数据库: SQLite (./sqlite3.db, $db_size)"
+    elif [ -f "$SCRIPT_DIR/$BACKEND_DIR/sqlite3.db" ]; then
         local db_size=$(du -h "$SCRIPT_DIR/$BACKEND_DIR/sqlite3.db" | cut -f1)
-        info "数据库: SQLite (sqlite3.db, $db_size)"
+        info "数据库: SQLite (backend/sqlite3.db 旧路径, $db_size)"
     fi
 }