refactor(core): align with cordis spatiotemporal composability architecture

- Purify core micro-kernel by removing context hardcoded helpers and reverse dependencies
- Eliminate init() side effects in infra plugins with reversible lifecycle disposal
- Completely isolate plugins by removing cross-plugin imports and using core/contracts
- Introduce TaskService and RiskControlService contracts for unified cross-plugin APIs
- Regenerate Swagger documentation and update developer guide matrix
- Achieve 0 violations in check_cordis_architecture.sh and 100% test pass

backend/plugins/domain/admin/middlewares.go

@@ -4,12 +4,13 @@
 package admin
 
 import (
+	"github.com/gin-gonic/gin"
+
 	"Wavelet/core/contracts"
 	"Wavelet/pkg/logger"
 	"Wavelet/pkg/response"
 	"Wavelet/pkg/trace"
 	"Wavelet/pkg/util"
-	"github.com/gin-gonic/gin"
 )
 
 // LoginAdminRequired 返回管理员权限校验中间件