feat: main.go 接入配置 + graceful shutdown + logger 迁移

- main.go: 接入 config.Load() 替换硬编码 :8080
- main.go: 添加 signal.NotifyContext + http.Server.Shutdown（10s drain）
- main.go: 初始化 Zap 日志，prod 环境切换 Gin release 模式
- ws/handler.go: 所有 log.Printf 替换为 logger.Log 结构化日志
- 修复 .gitignore 排除规则（/server 仅匹配根目录二进制）
- 新增 zap、viper 依赖

backend/go.sum

@@ -9,6 +9,10 @@ github.com/cloudwego/iasm v0.2.0/go.mod h1:8rXZaNYT2n95jn+zTI1sDr+IgcD2GVs0nlbbQ
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@@ -23,10 +27,12 @@ github.com/go-playground/universal-translator v0.18.1 h1:Bcnm0ZwsGyWbCzImXv+pAJn
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@@ -38,6 +44,10 @@ github.com/klauspost/cpuid/v2 v2.0.9/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa02
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@@ -47,26 +57,48 @@ github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w
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@@ -76,16 +108,15 @@ golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
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