feat: declare the dashboard and templates sub-pages in the interface manifest

[hieptl]

• A human has tested these changes.

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Why

Brings the Automate Dashboard and Templates sub-pages (from the closed agent-canvas#1816) back as manifest-driven surfaces. This repo is the source of truth for automation-specific UI, so the page definitions — sub-page navigation, overview tiles, filters, sort, insight captions, and copy — must live here; Agent Canvas only gains generic primitives that render whatever an admitted manifest declares. interface.json v1.0 had no vocabulary for any of this (the schema's closed key set deliberately rejected it), so this is the contract extension.

Summary

• automations/interface.json: declare routes.templates, navigation.subPages (Dashboard / Templates with icon slugs), pages.list.{overview,filters,sort,insights} reproducing the agent-canvas#1816 product surface (4 tiles, status/trigger filters with an always-offered "all", 3 sorts defaulting to last-run, health and run-stat captions), and pages.templates; the list page identity becomes "Dashboard".
• automations/interface.schema.json: matching closed $defs (iconSlug, subPageNavItem, overview/overviewTile with per-metric {{active}} placeholder enforcement and zeroDetail, statusFilter/triggerFilter requiring the all option, sort, insights, templatesPage); additionalProperties: false everywhere, all new keys required.
• automations/index.d.ts mirrors the new shapes; the README's interface-manifest section documents the keys and the host-derivation rules; four new schema-reject cases pin the new trust rules (unknown sub-page, unknown icon, unexposed placeholder, missing all option).

Issue Number

Resolves OpenHands/OpenHands#15466

How to Test

1. uv run --group test pytest — 516 passed (the interface suite grows from 12 to 16 cases; every pre-existing case is untouched, including the top-level unknown-key rejection).
2. Export check: node --input-type=module -e "import('./automations/index.js').then(m => console.log(m.AUTOMATION_INTERFACE.navigation.subPages, m.AUTOMATION_INTERFACE.pages.templates))" — prints the declared sub-pages and templates identity.
3. Cross-repo: npm pack this branch and install the tarball into the Agent Canvas branch for OSS-5187 — its admission validator accepts the manifest whole (valid: true) and the Dashboard/Templates sub-pages render; with the pinned registry 0.12.0 (no AUTOMATION_INTERFACE) Canvas stays byte-identical to today.

Video/Screenshots

OSS-5187.mov

[all-hands-bot]

👋 This PR needs a couple of things fixed before OpenHands can review it:

• the PR description's HUMAN: section needs at least 20 characters describing what you tested, not just the template placeholder

Push an update once this is addressed and this check re-runs automatically.

This is an automated check - no AI was used to generate this comment.

[tofarr]

🍰

[openhands-release-bot]

🚀 Released in v0.16.0.