fix(pool-account): 修复 seed.ts 覆盖池余额 + 激活挖矿前校验池余额

1. seed.ts upsert 的 update 子句移除 balance/targetBurn/remainingBurn，
   避免重新部署时将已有池余额清零（导致 BurnConsumer 和
   MiningDistributionConsumer 因余额不足崩溃）
2. activateMining 激活前检查 SHARE_POOL_A/B 余额，任一为0则阻止激活
   并返回 400 错误提示先通过区块链充值

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/services/mining-admin-service/src/api/controllers/config.controller.ts

@@ -152,6 +152,32 @@ export class ConfigController {
   @ApiOperation({ summary: '激活挖矿' })
   async activateMining(@Req() req: any) {
     const miningServiceUrl = this.appConfigService.get<string>('MINING_SERVICE_URL', 'http://localhost:3021');
+    const walletServiceUrl = this.appConfigService.get<string>('MINING_WALLET_SERVICE_URL', 'http://localhost:3025');
+
+    // 安全检查：池账户余额不能为0
+    try {
+      const [poolARes, poolBRes] = await Promise.all([
+        fetch(`${walletServiceUrl}/api/v2/pool-accounts/SHARE_POOL_A`),
+        fetch(`${walletServiceUrl}/api/v2/pool-accounts/SHARE_POOL_B`),
+      ]);
+      if (poolARes.ok && poolBRes.ok) {
+        const poolA = await poolARes.json();
+        const poolB = await poolBRes.json();
+        const balA = parseFloat(poolA?.data?.balance ?? poolA?.balance ?? '0');
+        const balB = parseFloat(poolB?.data?.balance ?? poolB?.balance ?? '0');
+        if (balA <= 0 || balB <= 0) {
+          const msg = `池账户余额不足，无法激活挖矿。积分股池A余额: ${balA}，积分股池B余额: ${balB}。请先通过区块链充值。`;
+          this.logger.warn(msg);
+          throw new BadRequestException(msg);
+        }
+      } else {
+        this.logger.warn('无法获取池账户余额，跳过安全检查');
+      }
+    } catch (error) {
+      if (error instanceof BadRequestException) throw error;
+      this.logger.warn('池账户余额检查失败，跳过安全检查', error);
+    }
+
     try {
       const response = await fetch(`${miningServiceUrl}/api/v2/mining/admin/activate`, {
         method: 'POST',
@@ -163,6 +189,7 @@ export class ConfigController {
       this.logger.log(`Mining activated by admin ${req.admin?.id}`);
       return result;
     } catch (error) {
+      if (error instanceof BadRequestException) throw error;
       this.logger.error('Failed to activate mining', error);
       return { success: false, message: 'Failed to activate mining' };
     }

backend/services/mining-wallet-service/prisma/seed.ts

@@ -66,7 +66,7 @@ async function main() {
   // 积分股池A: 100亿 (10,000,000,000) - 用于销毁
   // 积分股池B: 200万 (2,000,000) - 用于挖矿分配
   // 总计: 100.02亿 (10,002,000,000)
-  // 直接 upsert 覆盖，不检查是否存在
+  // upsert: 已存在时只更新元数据（name/description），不覆盖余额等运营数据
   const poolAccounts = [
     {
       poolType: 'SHARE_POOL_A',
@@ -99,10 +99,8 @@ async function main() {
     const created = await prisma.poolAccount.upsert({
       where: { poolType: pool.poolType as any },
       update: {
+        // 仅更新元数据，绝不覆盖 balance/targetBurn/remainingBurn
         name: pool.name,
-        balance: pool.balance,
-        targetBurn: pool.targetBurn,
-        remainingBurn: pool.targetBurn,
         description: pool.description,
         isActive: true,
       },