revert: 去掉资源历史查询逻辑, 保留纯IP+is_primary分配

- 网盘分享按新资源奖励机制, 不需追资源转存历史
- getAndValidateCredential 去掉 shareUrl 参数
- 保留 save_records.config_id 字段(仅用于日志排查)

packages/backend/src/cloud/cloud.service.ts

@@ -141,7 +141,7 @@ async function doSaveFromShare(shareUrl: string, cloudType: string, sourceTitle?
   }
 
   // ── Unified credential validation ──
-  const credential = await getAndValidateCredential(cloudType, ipAddress, shareUrl);
+  const credential = await getAndValidateCredential(cloudType, ipAddress);
   if (!credential.valid || !credential.config) {
     return { success: false, message: credential.message };
   }

packages/backend/src/cloud/credential.service.ts

@@ -423,37 +423,12 @@ export interface CredentialValidationResult {
  * 
  * Reference: search-ucmao get_and_validate_credential() pattern.
  */
-export async function getAndValidateCredential(cloudType: string, ipAddress?: string, shareUrl?: string): Promise<CredentialValidationResult> {
+export async function getAndValidateCredential(cloudType: string, ipAddress?: string): Promise<CredentialValidationResult> {
   const db = getDb();
 
   let config: CloudConfig | undefined;
 
-  // ── Resource history lookup: if this share URL was saved before, reuse that account ──
-  if (shareUrl) {
-    const historyRecord = db.prepare(
-      `SELECT config_id, target_cloud, folder_name FROM save_records
-       WHERE share_url = ? AND target_cloud = ? AND status IN ('success', 'reused')
-       ORDER BY id DESC LIMIT 1`
-    ).get(shareUrl, cloudType) as { config_id: number; target_cloud: string; folder_name: string } | undefined;
 
-    if (historyRecord) {
-      // Resource was previously saved — reuse the exact same config if still healthy
-      if (historyRecord.config_id) {
-        config = db.prepare(
-          `SELECT * FROM cloud_configs WHERE id = ? AND is_active = 1 AND consecutive_failures < 5`
-        ).get(historyRecord.config_id) as CloudConfig | undefined;
-      }
-      if (!config) {
-        // Fallback: pick any healthy account from this cloud type
-        config = db.prepare(
-          `SELECT * FROM cloud_configs
-           WHERE cloud_type = ? AND is_active = 1 AND consecutive_failures < 5
-           ORDER BY is_primary DESC, last_used_at ASC NULLS FIRST
-           LIMIT 1`
-        ).get(cloudType) as CloudConfig | undefined;
-      }
-    }
-  }
 
   if (!ipAddress) {
     // No IP info — fallback to simple LUR