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/config/prizes.json

@@ -0,0 +1,42 @@
+{
+    "prizes": [
+        {
+            "round": 1,
+            "level": "第一轮抽奖",
+            "name": "幸运伴手礼",
+            "winnerCount": 7,
+            "poolTag": "6070",
+            "description": "60/70年代"
+        },
+        {
+            "round": 2,
+            "level": "第二轮抽奖",
+            "name": "幸运伴手礼",
+            "winnerCount": 3,
+            "poolTag": "80",
+            "description": "80年代"
+        },
+        {
+            "round": 3,
+            "level": "第三轮抽奖",
+            "name": "幸运伴手礼",
+            "winnerCount": 4,
+            "poolTag": "90",
+            "description": "90年代"
+        },
+        {
+            "round": 4,
+            "level": "第四轮抽奖",
+            "name": "幸运伴手礼",
+            "winnerCount": 1,
+            "poolTag": "horse",
+            "zodiacFilter": "horse",
+            "description": "属马特供"
+        }
+    ],
+    "settings": {
+        "minStormDuration": 3000,
+        "revealAnimationDuration": 2000,
+        "allowRepeatWinner": false
+    }
+}