chore: fresh-clone 可直接运行审查与修复

确保 git clone 后零配置(除 LLM key)即可跑通后端链路。

- go.work: 移出 sundynix-desktop(Wails，//go:embed frontend/dist 需先 npm build，
  且 main 为桩)，避免污染后端工作区构建；保留后端 4 模块
- mcp-py pyproject: 注释未 import 的 mcp/docker 重依赖(对应功能仍为桩)，
  fresh pip install 只装实际用到的 nats-py + docx/openpyxl/pypdf，更快更稳
- README: 完整环境改为 fresh-clone 零配置运行指引(infra→4后端→2前端→控制台配模型)
- 审查结论: 无硬编码绝对路径; 各服务 env 默认全对齐 docker-compose; go.sum/
  package-lock 齐全; /tmp clone 实测: 4 后端模块 go build ✓、admin npm ci+build ✓、
  mcp-py 全新 venv 安装+导入 ✓; e2e PASS

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

sundynix-gateway/go.mod

@@ -13,17 +13,18 @@ require (
 replace github.com/sundynix/sundynix-shared => ../sundynix-shared
 
 require (
-	github.com/bytedance/sonic v1.11.6 // indirect
-	github.com/bytedance/sonic/loader v0.1.1 // indirect
+	github.com/bytedance/gopkg v0.1.3 // indirect
+	github.com/bytedance/sonic v1.15.0 // indirect
+	github.com/bytedance/sonic/loader v0.5.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
-	github.com/cloudwego/base64x v0.1.4 // indirect
-	github.com/cloudwego/iasm v0.2.0 // indirect
+	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.3 // indirect
 	github.com/gin-contrib/sse v0.1.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.20.0 // indirect
 	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/google/go-cmp v0.6.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/pgx/v5 v5.6.0 // indirect
@@ -42,11 +43,11 @@ require (
 	github.com/nats-io/nkeys v0.4.7 // indirect
 	github.com/nats-io/nuid v1.0.1 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.2 // indirect
-	github.com/rogpeppe/go-internal v1.6.1 // indirect
+	github.com/rogpeppe/go-internal v1.8.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.2.12 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
-	golang.org/x/arch v0.8.0 // indirect
+	golang.org/x/arch v0.11.0 // indirect
 	golang.org/x/crypto v0.31.0 // indirect
 	golang.org/x/net v0.25.0 // indirect
 	golang.org/x/sync v0.10.0 // indirect