feat(schedule): add course table screens and navigation

Add complete schedule functionality including:
- Schedule screen with weekly course table view
- Course detail screen with transparent modal presentation
- New ScheduleStack navigator integrated into main tab bar
- Schedule service for API interactions
- Type definitions for course entities

Also includes bug fixes for group invite/request handlers
to include required groupId parameter.

internal/router/router.go

@@ -23,6 +23,7 @@ type Router struct {
 	stickerHandler       *handler.StickerHandler
 	gorseHandler         *handler.GorseHandler
 	voteHandler          *handler.VoteHandler
+	scheduleHandler      *handler.ScheduleHandler
 	jwtService           *service.JWTService
 }
 
@@ -41,6 +42,7 @@ func New(
 	stickerHandler *handler.StickerHandler,
 	gorseHandler *handler.GorseHandler,
 	voteHandler *handler.VoteHandler,
+	scheduleHandler *handler.ScheduleHandler,
 ) *Router {
 	// 设置JWT服务
 	userHandler.SetJWTService(jwtService)
@@ -59,6 +61,7 @@ func New(
 		stickerHandler:       stickerHandler,
 		gorseHandler:         gorseHandler,
 		voteHandler:          voteHandler,
+		scheduleHandler:      scheduleHandler,
 		jwtService:           jwtService,
 	}
 
@@ -160,6 +163,18 @@ func (r *Router) setupRoutes() {
 			posts.DELETE("/:id/vote", authMiddleware, r.voteHandler.Unvote)                            // 取消投票
 		}
 
+		// 课表路由
+		if r.scheduleHandler != nil {
+			schedule := v1.Group("/schedule")
+			schedule.Use(authMiddleware)
+			{
+				schedule.GET("/courses", r.scheduleHandler.ListCourses)
+				schedule.POST("/courses", r.scheduleHandler.CreateCourse)
+				schedule.PUT("/courses/:id", r.scheduleHandler.UpdateCourse)
+				schedule.DELETE("/courses/:id", r.scheduleHandler.DeleteCourse)
+			}
+		}
+
 		// 投票选项路由
 		voteOptions := v1.Group("/vote-options")
 		voteOptions.Use(authMiddleware)