Remove dead ASR task and fix object-detection UI conditionals

[Alvin-Nahabwe]

Stacked on #173 (fix/dl-client-contract) — both branches touch server/deep_learning.R. Review/merge #173 first; this PR's base will retarget to main automatically.

Remove the ASR task

ASR was fully wired in the client but targets an API surface that no longer exists: no /train/asr endpoint, no asr key in the model registry, no ASR inference script. Selecting ASR populated nothing; submitting failed.

Removed the training panel, inference panel, checkpoint finder, job submission, result outputs, and the four dropdown entries. grep -i asr across the repo now returns nothing.

Fix two object-detection conditionals

Both are real bugs, independent of ASR:

• RT-DETR was treated as a Transformers model. The API routes it to the Ultralytics trainer (is_ultralytics_model matches rtdetr), but the UI showed it the Transformers hyperparameters and hid the YOLO ones — so lr0, momentum, warmup_epochs etc. were unreachable for RT-DETR runs. Both panels now key off YOLO || RT-DETR.
• Inference IoU / max-detections were hardcoded to yolo11. They were hidden for yolov12, yolo26, and rtdetr checkpoints, all of which the API accepts them for. The condition now matches any yolo* checkpoint except yolos (a Transformers model), plus rtdetr.

Cleanup

Removed 281 lines of commented-out legacy UI at the foot of deeplearning_ui.R. Every removed line was verified to be a comment or blank before deletion; it remains in git history.

Net: +17 / −538.

Verification

parse() passes on both changed files. The app was not run — no Shiny server available. Please click through the DL tab (task switching, RT-DETR arch selection, inference panel) before merging.

Open question

The Hub & Logging panels still expose push_to_hub, hub_user_id, log_to_wandb, wandb_project, wandb_entity for all three tasks. The API ignores every one of them, and all training scripts set WANDB_DISABLED=true. These controls silently do nothing. I've left them in place pending a decision: finish the W&B integration, or remove the panels?

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