feat: scaffold codespace backend

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

internal/api/process_handler.go

@@ -0,0 +1,55 @@
+package api
+
+import (
+	"net/http"
+
+	"codespace/internal/model"
+	"codespace/internal/service"
+
+	"github.com/gin-gonic/gin"
+)
+
+type processHandler struct {
+	svc *service.ProcessService
+}
+
+func (h *processHandler) start(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.svc.Start(id); err != nil {
+		writeError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
+
+func (h *processHandler) stop(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.svc.Stop(id); err != nil {
+		writeError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
+
+func (h *processHandler) restart(c *gin.Context) {
+	id := c.Param("id")
+	if err := h.svc.Restart(id); err != nil {
+		writeError(c, err)
+		return
+	}
+	c.Status(http.StatusNoContent)
+}
+
+func (h *processHandler) status(c *gin.Context) {
+	id := c.Param("id")
+	status, err := h.svc.Status(id)
+	if err != nil {
+		writeError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, model.ProcessStatusResponse{
+		WorkspaceID: status.WorkspaceID,
+		Running:     status.Running,
+		PID:         status.PID,
+	})
+}