docs(FR-2623): reorganize admin model serving docs and remove clone references

[agatha197]

Resolves #6843 (FR-2623)

Summary

• Moved Admin features (Admin Serving Page, Admin Model Store Management) from model_serving.md to admin_menu.md across all 4 languages — admin-only content now lives in the Admin Menu section where it belongs.
• Removed all clone-related content from admin_menu.md and model_serving.md (Clone to Folder, Create Service from This Model, Cloning a Model). The clone feature is no longer provided by the product.
• Rewrote the model-definition.yaml description as an advanced configuration option for the Custom runtime variant during serving. The old wording incorrectly implied that uploading the file creates a model card; model cards are now managed via the Admin UI backed by the database.
• Removed the stale old Model Store Page section along with the model_card_added.png reference.
• Kept the Cloneable field in vfolder.md — it is still a real field in the vfolder creation modal.

Test Plan

• Verify admin_menu.md renders correctly with the new Admin Features section in en/ko/ja/th
• Verify model_serving.md no longer references clone or admin-only features in en/ko/ja/th
• Verify the vfolder.md Cloneable field documentation is intact in en/ko/ja/th
• Rebuild the PDF locally and spot-check the reorganized pages

[agatha197]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• docs(FR-2624): translate remaining English headings in ja and th docs #6846
• docs(FR-2623): reorganize admin model serving docs and remove clone references #6844 👈 (View in Graphite)
• docs(FR-2603): add health check SVG diagrams for all 4 languages, replace ASCII art #6839
• docs(FR-2603): update auto scaling V2 screenshots, fix bold rendering, correct health check initial status, revise condition/cooldown terminology #6807
• docs(FR-2603): apply 26.4 model serving doc feedback — service launcher fields, vLLM/SGLang runtime params #6804
• docs(FR-2571): address 26.4 docs feedback — remove legacy model serving sections and apply KO wording fixes #6778
• docs: add endpoint detail page revision info, alert banners, and edit behavior docs #6767
• docs(FR-2571): document Model Store V2 and Auto Scaling Rules V2 (26.4.0+) #6760
• docs(FR-2571): address PR #6631 review feedback (excl. model store) #6708
• docs(FR-2571): add Allowed Client IPs field to My Account dialog documentation #6631 : 1 other dependent PR (#6633 )
• docs(FR-2570): recapture login screenshots with TOTP OTP screen in light mode #6630
• docs(FR-2569): recapture start_announcement_banner in light mode #6625
• docs(FR-2543): update model serving documentation with new features #6611
• docs(FR-2542): update date selection UI in statistics documentation #6580
• docs(FR-2541): fix permission label formatting in vfolder documentation #6579
• docs(FR-2540): fix session type filters in session_page documentation #6578
• docs(FR-2539): update copy button location in my_environments documentation #6577
• docs(FR-2538): fix button labels in import_run documentation #6576
• docs(FR-2537): add board customization and auto-refresh to dashboard docs #6575
• main

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