[FuTseYi]

Changes

• Expand the real Ultralytics CPU smoke test from wheat-only to each bundled crop checkpoint: apple, corn, cotton, grape, potato, rice, strawberry, tomato and wheat.
• Load one matching sample JPG from each of the nine existing assets/samples/<crop> folders; assert result image dimensions and boxes structure, then release model memory.
• Update the optional model-check workflow job label and the verification matrix.

Verification policy

• Routine PR CI runs syntax, unit tests, docs links, Vue and Spring Boot compilation. After merge, selective main-branch push trigger will run the real multi-checkpoint smoke workflow.
• No detection accuracy claims. Model loading and basic output structure do not validate disease class labels, model calibration, or camera/video/end-to-end application behavior.
• No checkpoint or sample image files are modified.