refactor: reorganize struct fields, add new handlers and storage backends

- [x] Reorder struct fields across codebase for consistency
- [x] Add analytics event handlers and tests
- [x] Add authentication API key management handlers and tests
- [x] Add pre-warming control handlers and tests
- [x] Implement S3 storage backend with tests
- [x] Implement SMB/CIFS storage backend with tests
- [x] Add CDN middleware tests
- [x] Integrate analytics tracking into cache manager
- [x] Add S3 and SMB storage initialization in app setup
- [x] Add CDN caching to proxy handlers
- [x] Remove distributed locking (Redis lock manager)
- [x] Remove proxy common package and utilities
- [x] Remove standalone HTTP server package
- [x] Remove logger middleware
- [x] Simplify error handling utilities
- [x] Update config with S3 and SMB options
- [x] Update cache manager signature to include analytics

pkg/app/handlers_prewarming.go

@@ -0,0 +1,94 @@
+package app
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"github.com/rs/zerolog/log"
+)
+
+// handlePrewarmingStatus returns the status of the pre-warming worker
+func (a *App) handlePrewarmingStatus(c *fiber.Ctx) error {
+	c.Set("Content-Type", "application/json")
+
+	status := a.prewarmWorker.GetStatus()
+
+	return c.Status(fiber.StatusOK).JSON(status)
+}
+
+// handlePrewarmingTrigger manually triggers a pre-warming cycle
+func (a *App) handlePrewarmingTrigger(c *fiber.Ctx) error {
+	c.Set("Content-Type", "application/json")
+
+	ctx := c.Context()
+	a.prewarmWorker.TriggerPrewarm(ctx)
+
+	log.Info().Msg("Pre-warming manually triggered via API")
+
+	return c.Status(fiber.StatusOK).JSON(fiber.Map{
+		"message": "Pre-warming cycle triggered successfully",
+	})
+}
+
+// PrewarmPackageRequest represents a request to pre-warm a specific package
+type PrewarmPackageRequest struct {
+	Registry string `json:"registry"`
+	Name     string `json:"name"`
+	Version  string `json:"version"`
+}
+
+// handlePrewarmingPackage pre-warms a specific package
+func (a *App) handlePrewarmingPackage(c *fiber.Ctx) error {
+	c.Set("Content-Type", "application/json")
+
+	var req PrewarmPackageRequest
+	if err := c.BodyParser(&req); err != nil {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "invalid JSON in request body",
+		})
+	}
+
+	// Validate request
+	if req.Registry == "" {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "registry is required",
+		})
+	}
+	if req.Name == "" {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "name is required",
+		})
+	}
+	if req.Version == "" {
+		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{
+			"error": "version is required",
+		})
+	}
+
+	ctx := c.Context()
+	err := a.prewarmWorker.PrewarmPackage(ctx, req.Registry, req.Name, req.Version)
+	if err != nil {
+		log.Error().
+			Err(err).
+			Str("registry", req.Registry).
+			Str("name", req.Name).
+			Str("version", req.Version).
+			Msg("Failed to pre-warm package")
+		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{
+			"error": "failed to pre-warm package",
+		})
+	}
+
+	log.Info().
+		Str("registry", req.Registry).
+		Str("name", req.Name).
+		Str("version", req.Version).
+		Msg("Package pre-warmed via API")
+
+	return c.Status(fiber.StatusOK).JSON(fiber.Map{
+		"message": "Package pre-warmed successfully",
+		"package": fiber.Map{
+			"registry": req.Registry,
+			"name":     req.Name,
+			"version":  req.Version,
+		},
+	})
+}