feat: compare limit 9, format-aware import placeholder, help links

- Raise compare limit from 8 to 9 (server + client, toast on overflow)
- Make import textarea placeholder match selected format (CSV/JSON/YAML/auto)
- Add GuideHelp links to admin create/edit user dialogs and tool import dialog

docs/releases/v0.9.2/handbook/kosten.en.md

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+
+# Recording Costs
+
+On the detail page of a tool you can enter cost and license models so that
+the total costs per tool become transparent.
+
+> Costs is a **premium feature** (`costs`, Premium/Enterprise). Admins always
+> have access.
+
+## Adding costs
+
+Click **Add costs** in the costs section of the detail page and fill out the
+form:
+
+| Field | Notes |
+| --- | --- |
+| **License type** | Free / Subscription / One-Time / Usage-Based |
+| **Billing period** | Only for "Subscription": Monthly / Quarterly / Annually |
+| **Costs** | Amount as a number |
+| **Currency** | EUR / USD / GBP / CHF |
+| **Notes** | Optional free text |
+
+Saving creates the entry. Each cost entry is displayed as a card with
+license badge, billing period, amount (`Amount Currency` or "Free") and
+notes.
+
+## Editing & deleting costs
+
+Hovering over a cost card shows the **Edit** (pencil) and **Delete** (trash)
+actions.
+
+## API
+
+The cost data is managed via the tool endpoints
+(see [API reference](/docs/reference/endpoints/tools)).