feat: Refactor platform.go to extract domain handlers into separate files and retain only shared helpers

- Add package documentation mapping handler files to domains (services/monitoring/deployments/plugins/automation/config/chaos/billing)
- Remove gorm.io/gorm, models, monitoring, and services package imports
- Remove ServicesHandler struct and all methods (List/Get/Restart/Start/Stop/Scale/Logs/Health/PodStatus/Events)
- Remove MonitoringHandler struct and all methods (Metrics/Alerts/Health/Logs)

apps/api-server/internal/handlers/platform_deployments.go

@@ -0,0 +1,89 @@
+package handlers
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/gin-gonic/gin"
+
+	"github.com/nutcas3/telecom-platform/apps/api-server/internal/services"
+)
+
+// DeploymentsHandler exposes deployment lifecycle endpoints.
+type DeploymentsHandler struct {
+	svc *services.DeploymentService
+}
+
+// NewDeploymentsHandler constructs a DeploymentsHandler.
+func NewDeploymentsHandler(svc *services.DeploymentService) *DeploymentsHandler {
+	return &DeploymentsHandler{svc: svc}
+}
+
+func (h *DeploymentsHandler) Status(c *gin.Context) {
+	f := services.DeploymentFilter{
+		Service:     c.Query("service"),
+		Environment: c.Query("environment"),
+		Status:      "in_progress",
+		Limit:       50,
+	}
+	items, total, err := h.svc.List(c.Request.Context(), f)
+	if err != nil {
+		serverError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{"deployments": items, "total": total})
+}
+
+func (h *DeploymentsHandler) Start(c *gin.Context) {
+	var in services.StartDeploymentInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		badRequest(c, err)
+		return
+	}
+	d, err := h.svc.Start(c.Request.Context(), in)
+	if err != nil {
+		serverError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, d)
+}
+
+func (h *DeploymentsHandler) Rollback(c *gin.Context) {
+	var in services.RollbackInput
+	if err := c.ShouldBindJSON(&in); err != nil {
+		badRequest(c, err)
+		return
+	}
+	d, err := h.svc.Rollback(c.Request.Context(), in)
+	if err != nil {
+		serverError(c, err)
+		return
+	}
+	c.JSON(http.StatusCreated, d)
+}
+
+func (h *DeploymentsHandler) History(c *gin.Context) {
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	if pageSize > 100 {
+		pageSize = 100
+	}
+	f := services.DeploymentFilter{
+		Service:     c.Query("service"),
+		Environment: c.Query("environment"),
+		Status:      c.Query("status"),
+		Limit:       pageSize,
+		Offset:      (page - 1) * pageSize,
+	}
+	items, total, err := h.svc.List(c.Request.Context(), f)
+	if err != nil {
+		serverError(c, err)
+		return
+	}
+	c.JSON(http.StatusOK, gin.H{
+		"deployments": items,
+		"total":       total,
+		"page":        page,
+		"page_size":   pageSize,
+	})
+}