feat(contact): Controller、Router 与 Wire 集成

- controller/contact_controller.go: 全部 17 个 REST API 端点处理器
- router.go: Contact 模块路由注册（JWT 中间件保护）
- provider.go: Wire Provider Set（DAO + Service + Controller）
- 更新全局 provider、wire.go、router.go 集成 Contact 模块

Made-with: Cursor

backend/go-service/app/contact/router.go

@@ -0,0 +1,39 @@
+// Package contact 提供联系人/好友管理模块
+package contact
+
+import (
+	"github.com/echochat/backend/app/contact/controller"
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterRoutes 注册 contact 模块的所有路由（需要 JWT 中间件）
+func RegisterRoutes(r *gin.Engine, ctrl *controller.ContactController, jwtAuth gin.HandlerFunc) {
+	authed := r.Group("/api/v1")
+	authed.Use(jwtAuth)
+	{
+		// 好友关系
+		authed.GET("/contacts", ctrl.GetFriendList)
+		authed.POST("/contacts/request", ctrl.SendFriendRequest)
+		authed.POST("/contacts/accept", ctrl.AcceptFriendRequest)
+		authed.POST("/contacts/reject", ctrl.RejectFriendRequest)
+		authed.DELETE("/contacts/:id", ctrl.DeleteFriend)
+		authed.PUT("/contacts/:id/remark", ctrl.UpdateRemark)
+		authed.GET("/contacts/requests", ctrl.GetPendingRequests)
+
+		// 好友分组
+		authed.GET("/contacts/groups", ctrl.GetGroups)
+		authed.POST("/contacts/groups", ctrl.CreateGroup)
+		authed.PUT("/contacts/groups/:id", ctrl.UpdateGroup)
+		authed.DELETE("/contacts/groups/:id", ctrl.DeleteGroup)
+		authed.PUT("/contacts/:id/group", ctrl.MoveToGroup)
+
+		// 黑名单
+		authed.POST("/contacts/block", ctrl.BlockUser)
+		authed.DELETE("/contacts/block/:user_id", ctrl.UnblockUser)
+		authed.GET("/contacts/block", ctrl.GetBlockList)
+
+		// 搜索与推荐
+		authed.GET("/users/search", ctrl.SearchUsers)
+		authed.GET("/contacts/recommend", ctrl.GetRecommendFriends)
+	}
+}