…4.0+) (#6760)

Stacked on top of PR #6708 (the `excl. model store` PR). Completes the FR-2571 docs work by documenting the Model Store V2 and Auto Scaling Rules V2 surfaces that were intentionally deferred from #6708.

## Structural approach

Decided with the user: document **both legacy and V2 paths side-by-side, split by explicit Backend.AI manager version**. Legacy prose stays in place as-is; V2 is appended as a versioned `####` subsection with a `:::note` admonition pointing from the legacy block to the new block. No `<details>` collapsibles — both variants are equally visible.

The structural pattern used in every affected section:

```markdown
### Section Heading

<legacy prose — kept, with legacy screenshot>

:::note
From Backend.AI version 26.4.0 onwards, this section has been redesigned. If
you are on an older version, the description above still applies. Otherwise,
refer to [Section (version 26.4.0 and later)](#section-version-26-4-0-and-later) below.
:::

<a id="section-version-26-4-0-and-later"></a>

#### Section (version 26.4.0 and later)

<V2 prose with new V2 screenshot>
```

## Version resolution

**Backend.AI manager 26.4.0** is the cutover version for both V2 surfaces. Verified at:

- `src/lib/backend.ai-client-esm.ts:895–904` — `model-card-v2` (line 901) and `prometheus-auto-scaling-rule` (line 903) are both gated on `isManagerVersionCompatibleWith('26.4.0')`.
- `.specs/draft-auto-scaling-rule-ux/spec.md:48` — auto-scaling spec explicitly states `>=26.4.0`.
- `.specs/model-store-v2-migration/dev-plan.md:13-25` — same manager version for model-store V2.

## Changes (applied identically across en / ko / ja / th)

### `model_serving.md` — three V2 subsections appended

1. **`### Auto Scaling Rules` → `#### Auto Scaling Rules (version 26.4.0 and later)`**: new Prometheus metric source with preset + live preview, Single/Range condition segmented control with directional threshold, Time Window (replaces legacy CoolDown Seconds), Step Size as positive integer with contextual sign prefix, separate Min/Max Replicas fields, property filters + pagination + Last Triggered column, inline Edit/Delete on Condition cell.
2. **`## Model Store` → `### Model Store (version 26.4.0 and later)`**: search+sort layout (replaces Category/Task/Label dropdowns), card detail Drawer (replaces Modal), card 50%-opacity + Deploy-disabled state for zero-preset models, two-scenario Deploy flow (auto-deploy vs Deploy Model selection modal), explicit absence of Clone button with cross-page link to `../vfolder/vfolder.md`.
3. **`### Admin Model Store Management` → `#### Admin Model Store Management (version 26.4.0 and later)`**: new column set (Name / Title / Category / Task / Access Level / Domain / Project / Created At — no Labels, no separate Controls column), `Private` / `Public` access tags, name-only property filter, inline Edit/Delete on Name cell via `BAINameActionCell`, row-selection bulk delete, explicit note that `Scan Project Model Cards` button is not available in 26.4.0+.

### Ripple edits (3 sites augmented, not replaced)

- `### Guide to Steps for Using Model Service` `:::tip` block
- `### Creating a Service Definition File` (two references)

Pattern: ``Run this model`` button (``Deploy`` on version 26.4.0 and later).

### 7 new V2 screenshots

Captured in English UI, copied byte-identically to all 4 language `images/` dirs (MD5 verified).

- `auto_scaling_rules_v2.png`
- `auto_scaling_rules_modal_v2.png` (Kernel + Single)
- `auto_scaling_rules_modal_prometheus_v2.png` (Prometheus preset + Range)
- `model_store_page_v2.png`
- `model_card_detail_drawer.png`
- `model_card_deploy_modal.png`
- `admin_model_card_list_v2.png`

Existing legacy screenshots (`auto_scaling_rules.png`, `auto_scaling_rules_modal.png`, `model_store_page.png`, `model_card_detail_modal.png`, `model_clone_dialog.png`, `admin_model_card_list.png`) are untouched and continue to document the legacy variants.

### Bug fix

Broken cross-reference `[Data](#data)` → `[Data](../vfolder/vfolder.md)` (relative cross-page link per project convention).

## Structural parity verification

- 43 headings per file, identical `#`-level sequences across en/ko/ja/th.
- 3 English-only anchors (`auto-scaling-rules-version-26-4-0-and-later`, `model-store-version-26-4-0-and-later`, `admin-model-store-management-version-26-4-0-and-later`) present in all four files.
- All 7 V2 image references identical across languages.
- Legacy prose intact — only diffs outside the new V2 blocks are the 3 ripple-site rewrites.
- `book.config.yaml` unchanged (no new top-level pages introduced).

## Agent workflow

Planned via `docs-update-planner` → written via `docs-update-writer` → quality reviewed via `docs-update-reviewer` (18 auto-fixes applied: PUBLIC → Public tag casing, 3-space indented notes → `:::note` admonitions, `Backend.AI version 26.4.0` prefix consistency) → screenshots via `docs-screenshot-capturer`.

Artifacts (in `.agent-output/`, gitignored):
- `docs-update-plan-model-store-and-autoscaling.md`
- `docs-review-report-model-store-and-autoscaling.md`

**Checklist:**
- [x] Documentation
- [x] Structural parity across en/ko/ja/th verified
- [x] Version number resolved (26.4.0) and referenced consistently
- [x] Cross-page links and image references verified
- [x] Legacy prose preserved; V2 subsections appended via `:::note` + anchor pattern
- [x] No `TODO(needs-version)` markers remain

🤖 Generated with [Claude Code](https://claude.com/claude-code)