feat: 七牛云存储支持（本地缓存/备份）

- StorageService 抽象层（store/read/exists）
- QiniuStorageService: 七牛云主存储（@ConditionalOnProperty）
- LocalStorageService: 本地文件存储（默认/@ConditionalOnMissingBean）
- CachedStorageService: 七牛主+本地缓存（写:七牛→本地, 读:本地→七牛）
- 配置: PAR_STORAGE_TYPE=qiniu + QINIU_AK/SK/BUCKET/REGION
- 不配七牛时自动降级到纯本地存储

par-api/src/main/java/com/par/api/controller/ConfigController.java

@@ -4,19 +4,13 @@ import com.par.core.dto.ApiResponse;
 import com.par.core.dto.SiteConfigDTO;
 import com.par.core.entity.SiteConfig;
 import com.par.core.service.ConfigService;
+import com.par.core.storage.StorageService;
 import jakarta.servlet.http.HttpServletRequest;
-import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.*;
 
-import java.io.IOException;
-import java.nio.charset.StandardCharsets;
-import java.nio.file.Files;
-import java.nio.file.Path;
-import java.nio.file.Paths;
 import java.util.List;
 import java.util.Map;
 
@@ -27,13 +21,15 @@ import java.util.Map;
 @Slf4j
 @RestController
 @RequestMapping("/api/v1/configs")
-@RequiredArgsConstructor
 public class ConfigController {
 
     private final ConfigService configService;
+    private final StorageService storageService;
 
-    @Value("${par.static.path:./static}")
-    private String staticPath;
+    public ConfigController(ConfigService configService, StorageService storageService) {
+        this.configService = configService;
+        this.storageService = storageService;
+    }
 
     /**
      * 列出所有待审核配置
@@ -76,19 +72,18 @@ public class ConfigController {
                     .build();
         }
 
-        // 读取文件内容
-        Path filePath = Paths.get(staticPath, config.getStoragePath());
+        // 读取文件内容（通过存储抽象：本地缓存或七牛云）
         String content;
         try {
-            content = Files.readString(filePath, StandardCharsets.UTF_8);
-        } catch (IOException e) {
-            log.error("Failed to read config file: {}", filePath, e);
+            content = storageService.read(config.getStoragePath());
+        } catch (Exception e) {
+            log.error("Failed to read config: siteId={}, version={}", siteId, version, e);
             return ResponseEntity.status(500).body("Failed to read config");
         }
 
         return ResponseEntity.ok()
                 .eTag(config.getConfigHash())
-                .header(HttpHeaders.CONTENT_TYPE, "application/json")
+                .header(org.springframework.http.HttpHeaders.CONTENT_TYPE, "application/json")
                 .body(content);
     }
 

par-api/src/main/resources/application.yml

@@ -46,6 +46,13 @@ mybatis-plus:
 par:
   static:
     path: ${PAR_STATIC_PATH:./data/static}
+  storage:
+    type: ${PAR_STORAGE_TYPE:local}   # qiniu / local
+    qiniu:
+      access-key: ${QINIU_AK:}
+      secret-key: ${QINIU_SK:}
+      bucket: ${QINIU_BUCKET:par-configs}
+      region: ${QINIU_REGION:z2}
   mediabot:
     psk: ${PAR_MEDIABOT_PSK:}
   admin: