refactor: extract models/routes and env-based server config

- Move API request/response structs into new lib/models package
- Centralize Gin route registration in lib/routing to simplify wiring
- Add lib/server config helper to allow WARPBOX_BOX_POLL_INTERVAL_MS override
- Improves modularity and makes polling behavior configurable per environmentrefactor: extract models/routes and env-based server config

- Move API request/response structs into new lib/models package
- Centralize Gin route registration in lib/routing to simplify wiring
- Add lib/server config helper to allow WARPBOX_BOX_POLL_INTERVAL_MS override
- Improves modularity and makes polling behavior configurable per environment

lib/models/models.go

@@ -0,0 +1,33 @@
+package models
+
+type BoxFile struct {
+	ID           string `json:"id"`
+	Name         string `json:"name"`
+	Size         int64  `json:"size"`
+	SizeLabel    string `json:"size_label"`
+	MimeType     string `json:"mime_type"`
+	Status       string `json:"status"`
+	StatusLabel  string `json:"status_label"`
+	Title        string `json:"title"`
+	IconPath     string `json:"icon_path"`
+	DownloadPath string `json:"download_path"`
+	UploadPath   string `json:"upload_path"`
+	IsComplete   bool   `json:"is_complete"`
+}
+
+type BoxManifest struct {
+	Files []BoxFile `json:"files"`
+}
+
+type CreateBoxRequest struct {
+	Files []CreateBoxFileRequest `json:"files"`
+}
+
+type CreateBoxFileRequest struct {
+	Name string `json:"name"`
+	Size int64  `json:"size"`
+}
+
+type UpdateFileStatusRequest struct {
+	Status string `json:"status"`
+}