feat(server): 完成 P2 后端能力（支付幂等、委派回收、OCR异步、审计）

server/src/config.js

@@ -42,6 +42,19 @@ function getConfig() {
     storageDir: path.resolve(serverRoot, storageDir),
     signedUrlTtlSeconds: Number(process.env.SIGNED_URL_TTL_SECONDS ?? 600),
     maxUploadSizeBytes: Number(process.env.MAX_UPLOAD_SIZE_BYTES ?? 10 * 1024 * 1024),
+
+    delegationRevokeCron: process.env.DELEGATION_REVOKE_CRON ?? "0 * * * *",
+
+    ocrProvider: process.env.OCR_PROVIDER ?? "off",
+    ocrBatchSize: Number(process.env.OCR_BATCH_SIZE ?? 10),
+    ocrLockTtlSeconds: Number(process.env.OCR_LOCK_TTL_SECONDS ?? 300),
+    ocrPollCron: process.env.OCR_POLL_CRON ?? "* * * * *",
+    ocrMaxAttempts: Number(process.env.OCR_MAX_ATTEMPTS ?? 3),
+    ocrTimeoutMs: Number(process.env.OCR_TIMEOUT_MS ?? 5000),
+
+    tencentSecretId: process.env.TENCENT_SECRET_ID ?? "",
+    tencentSecretKey: process.env.TENCENT_SECRET_KEY ?? "",
+    tencentOcrRegion: process.env.TENCENT_OCR_REGION ?? "ap-beijing",
   };
 }