feat(console,api): implement /console Admin Dashboard and Go backend full CRUD REST APIs

- Add comprehensive /console admin web UI for managing research projects, areas, members, publications, patents, lectures, and standards
- Implement Admin token authentication middleware (RequireAdminToken) with Bearer token validation
- Implement POST, PUT, DELETE REST API endpoints for all database entities across 5 domains
- Add typed admin API client in refer_landing_page/lib/adminApi.ts with localStorage session persistence
- Enhance E2E test runner to manage backend server lifecycle during automated tests
- Pass all 12 quality gates cleanly with unanimous reviewer PASS verdicts

backend/internal/handlers/lectures.go

@@ -1,11 +1,19 @@
 package handlers
 
 import (
+	"strconv"
+
 	"git.godopu.com/lab/landing_page/backend/internal/httpx"
+	"git.godopu.com/lab/landing_page/backend/internal/models"
 	"git.godopu.com/lab/landing_page/backend/internal/repository"
 	"github.com/gin-gonic/gin"
 )
 
+var validTerms = map[string]bool{
+	"Spring": true,
+	"Fall":   true,
+}
+
 type LecturesHandler struct {
 	repo *repository.LecturesRepository
 }
@@ -22,3 +30,119 @@ func (h *LecturesHandler) GetSemesters(c *gin.Context) {
 	}
 	httpx.OK(c, semesters)
 }
+
+func (h *LecturesHandler) CreateSemester(c *gin.Context) {
+	var req models.Semester
+	if err := c.ShouldBindJSON(&req); err != nil {
+		httpx.BadRequest(c, "Invalid request body: "+err.Error())
+		return
+	}
+	if req.Year < 1970 || !validTerms[req.Term] {
+		httpx.BadRequest(c, "Valid year and term ('Spring' or 'Fall') are required")
+		return
+	}
+	id, err := h.repo.CreateSemester(c.Request.Context(), req)
+	if err != nil {
+		httpx.InternalServerError(c, "Failed to create semester: "+err.Error())
+		return
+	}
+	req.ID = id
+	httpx.Created(c, req)
+}
+
+func (h *LecturesHandler) UpdateSemester(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil || id <= 0 {
+		httpx.BadRequest(c, "Invalid semester ID")
+		return
+	}
+	var req models.Semester
+	if err := c.ShouldBindJSON(&req); err != nil {
+		httpx.BadRequest(c, "Invalid request body: "+err.Error())
+		return
+	}
+	if req.Year < 1970 || !validTerms[req.Term] {
+		httpx.BadRequest(c, "Valid year and term ('Spring' or 'Fall') are required")
+		return
+	}
+	req.ID = id
+	if err := h.repo.UpdateSemester(c.Request.Context(), id, req); err != nil {
+		httpx.InternalServerError(c, "Failed to update semester: "+err.Error())
+		return
+	}
+	httpx.OK(c, req)
+}
+
+func (h *LecturesHandler) DeleteSemester(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil || id <= 0 {
+		httpx.BadRequest(c, "Invalid semester ID")
+		return
+	}
+	if err := h.repo.DeleteSemester(c.Request.Context(), id); err != nil {
+		httpx.InternalServerError(c, "Failed to delete semester: "+err.Error())
+		return
+	}
+	httpx.NoContent(c)
+}
+
+func (h *LecturesHandler) CreateCourse(c *gin.Context) {
+	semesterID, err := strconv.Atoi(c.Param("semesterId"))
+	if err != nil || semesterID <= 0 {
+		httpx.BadRequest(c, "Invalid semesterId parameter")
+		return
+	}
+	var req models.Course
+	if err := c.ShouldBindJSON(&req); err != nil {
+		httpx.BadRequest(c, "Invalid request body: "+err.Error())
+		return
+	}
+	if req.Code == "" || req.NameEn == "" {
+		httpx.BadRequest(c, "code and name_en are required")
+		return
+	}
+	req.SemesterID = semesterID
+	id, err := h.repo.CreateCourse(c.Request.Context(), req)
+	if err != nil {
+		httpx.InternalServerError(c, "Failed to create course: "+err.Error())
+		return
+	}
+	req.ID = id
+	httpx.Created(c, req)
+}
+
+func (h *LecturesHandler) UpdateCourse(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil || id <= 0 {
+		httpx.BadRequest(c, "Invalid course ID")
+		return
+	}
+	var req models.Course
+	if err := c.ShouldBindJSON(&req); err != nil {
+		httpx.BadRequest(c, "Invalid request body: "+err.Error())
+		return
+	}
+	if req.Code == "" || req.NameEn == "" {
+		httpx.BadRequest(c, "code and name_en are required")
+		return
+	}
+	req.ID = id
+	if err := h.repo.UpdateCourse(c.Request.Context(), id, req); err != nil {
+		httpx.InternalServerError(c, "Failed to update course: "+err.Error())
+		return
+	}
+	httpx.OK(c, req)
+}
+
+func (h *LecturesHandler) DeleteCourse(c *gin.Context) {
+	id, err := strconv.Atoi(c.Param("id"))
+	if err != nil || id <= 0 {
+		httpx.BadRequest(c, "Invalid course ID")
+		return
+	}
+	if err := h.repo.DeleteCourse(c.Request.Context(), id); err != nil {
+		httpx.InternalServerError(c, "Failed to delete course: "+err.Error())
+		return
+	}
+	httpx.NoContent(c)
+}