feat: enhance lottery system with participant import and prize config

- Fix ES module import issue in admin.service.ts (require -> import)
- Fix lottery reveal ghosting by hiding name particles on complete
- Add participant import from Excel with tag calculation
- Add prize configuration service with JSON persistence
- Constrain winners overlay to scroll area dimensions
- Fix macOS lsof syntax in stop script
- Add HorseRace view and renderer (WIP)

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

packages/server/src/routes/admin.routes.ts

@@ -1,6 +1,10 @@
 import { Router, IRouter } from 'express';
+import multer from 'multer';
+import { participantService } from '../services/participant.service';
+import { prizeConfigService } from '../services/prize-config.service';
 
 const router: IRouter = Router();
+const upload = multer({ storage: multer.memoryStorage() });
 
 /**
  * GET /api/admin/stats
@@ -12,7 +16,7 @@ router.get('/stats', async (_req, res, next) => {
     return res.json({
       success: true,
       data: {
-        totalUsers: 0,
+        totalUsers: participantService.getCount(),
         totalVotes: 0,
         activeConnections: 0,
       },
@@ -22,6 +26,53 @@ router.get('/stats', async (_req, res, next) => {
   }
 });
 
+/**
+ * GET /api/admin/prizes
+ * Get prize configuration
+ */
+router.get('/prizes', async (_req, res, next) => {
+  try {
+    const config = prizeConfigService.getFullConfig();
+    return res.json({
+      success: true,
+      data: config,
+    });
+  } catch (error) {
+    next(error);
+  }
+});
+
+/**
+ * PUT /api/admin/prizes
+ * Update prize configuration
+ */
+router.put('/prizes', async (req, res, next) => {
+  try {
+    const { prizes, settings } = req.body;
+
+    if (prizes) {
+      const result = await prizeConfigService.updatePrizes(prizes);
+      if (!result.success) {
+        return res.status(400).json({ success: false, error: result.error });
+      }
+    }
+
+    if (settings) {
+      const result = await prizeConfigService.updateSettings(settings);
+      if (!result.success) {
+        return res.status(400).json({ success: false, error: result.error });
+      }
+    }
+
+    return res.json({
+      success: true,
+      data: prizeConfigService.getFullConfig(),
+    });
+  } catch (error) {
+    next(error);
+  }
+});
+
 /**
  * POST /api/admin/draw/start
  * Start a lucky draw
@@ -54,4 +105,54 @@ router.post('/draw/stop', async (_req, res, next) => {
   }
 });
 
+/**
+ * POST /api/admin/participants/import
+ * Import participants from Excel file
+ * Expected columns: 岗位, 姓名, 年份
+ */
+router.post('/participants/import', upload.single('file'), async (req, res, next) => {
+  try {
+    if (!req.file) {
+      return res.status(400).json({
+        success: false,
+        error: '请上传 Excel 文件',
+      });
+    }
+
+    const result = await participantService.importFromExcel(req.file.buffer);
+
+    return res.json({
+      success: result.success,
+      data: {
+        totalCount: result.totalCount,
+        importedCount: result.importedCount,
+        tagDistribution: result.tagDistribution,
+        errors: result.errors,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+});
+
+/**
+ * GET /api/admin/participants
+ * Get all participants
+ */
+router.get('/participants', async (_req, res, next) => {
+  try {
+    const participants = participantService.getAll();
+    return res.json({
+      success: true,
+      data: {
+        count: participants.length,
+        participants,
+      },
+    });
+  } catch (error) {
+    next(error);
+  }
+});
+
 export default router;
+