feat: scaffold codespace backend

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

internal/api/workspace_handler.go

@@ -0,0 +1,51 @@
+package api
+
+import (
+	"net/http"
+
+	"codespace/internal/model"
+	"codespace/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+type workspaceHandler struct {
+	svc *service.WorkspaceService
+}
+
+func (h *workspaceHandler) create(c *gin.Context) {
+	var req model.CreateWorkspaceRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		writeBadRequest(c, "invalid json")
+		return
+	}
+	if req.ID == "" {
+		writeBadRequest(c, "id is required")
+		return
+	}
+	ws, err := h.svc.Create(req.ID)
+	if err != nil {
+		writeError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, model.WorkspaceResponse{ID: ws.ID})
+}
+
+func (h *workspaceHandler) get(c *gin.Context) {
+	id := c.Param("id")
+	ws, err := h.svc.Get(id)
+	if err != nil {
+		writeError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, model.WorkspaceResponse{ID: ws.ID})
+}
+
+func (h *workspaceHandler) delete(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.svc.Delete(id); err != nil {
+		writeError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}