feat(content): support indexed custom field sorting

[logelog]

What does this PR do?

Adds server-backed sorting for custom scalar fields that are explicitly marked indexed.

Collection fields gain an opt-in indexed flag. EmDash validates that flag against supported scalar field types, maintains a normalized index table when content changes, and allows the existing orderBy contract to sort by those field slugs. Sorting remains database-backed and cursor-safe, so it applies to the complete result set instead of only the currently loaded admin page.

This enables uses such as SEO score, ticket priority, workflow rank, or other numeric and textual metadata without introducing full-table scans.

This PR is stacked on #2194 to keep the five related content-list contributions conflict-free and reviewable at the same time. #2194 should merge first; GitHub will then narrow this PR to its unique sorting commit automatically.

Addresses the structured sorting portion of #2179.
Discussion: #1717

Type of change

• Bug fix
• Feature (requires maintainer-approved Discussion)
• Refactor (no behavior change)
• Translation
• Documentation
• Performance improvement
• Tests
• Chore (dependencies, CI, tooling)

Checklist

• I have read CONTRIBUTING.md
• pnpm typecheck passes
• pnpm lint passes
• pnpm test passes (or targeted tests for my change)
• pnpm format has been run
• I have added/updated tests for my changes (if applicable)
• User-visible strings in the admin UI are wrapped for translation (if applicable)
• I have added a changeset (if this PR changes a published package)
• New features link to an approved Discussion: Per-collection admin list columns (admin.listColumns) — show custom fields in the content list #1717

Screenshots / test output

Validated on EmDash 0.31 with Node 24 in WSL2:

• focused core sorting, migration, repository, and schema tests: 163 passed
• focused admin field configuration and content-list browser tests: 69 passed
• combined five-PR integration suite: 234 core and 120 admin tests passed
• pnpm typecheck
• pnpm lint:quick
• pnpm format:check
• pnpm --filter emdash --filter @emdash-cms/admin build

[changeset-bot]

🦋 Changeset detected

Latest commit: a3f5bcc

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 17 packages

Name	Type
emdash	Minor
@emdash-cms/admin	Minor
@emdash-cms/cloudflare	Minor
@emdash-cms/sandbox-workerd	Patch
@emdash-cms/plugin-mcp-smoke	Major
@emdash-cms/fixture-perf-site	Patch
@emdash-cms/perf-demo-site	Patch
@emdash-cms/cache-demo-site	Patch
@emdash-cms/do-demo-site	Patch
@emdash-cms/do-solo-demo-site	Patch
@emdash-cms/auth	Minor
@emdash-cms/blocks	Minor
@emdash-cms/gutenberg-to-portable-text	Minor
@emdash-cms/x402	Minor
create-emdash	Minor
@emdash-cms/auth-atproto	Patch
@emdash-cms/plugin-embeds	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[github-actions]

Scope check

This PR changes 920 lines across 35 files. Large PRs are harder to review and more likely to be closed without review.

If this scope is intentional, no action needed. A maintainer will review it. If not, please consider splitting this into smaller PRs.

See CONTRIBUTING.md for contribution guidelines.

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commit: a3f5bcc

[github-actions]

Overlapping PRs

This PR modifies files that are also changed by other open PRs:

• feat(content): filter indexed custom fields #2213 (35 shared files)
• feat(admin): allow trusted plugins to add content list columns #2195 (23 shared files)
• feat(admin): show configured fields in content lists #2194 (23 shared files)
• Harden plugin MCP tool registration #988 (3 shared files)
• feat(core): configurable displayField and dateField per collection #1973 (13 shared files)
• feat: reference field type (storage-less edges + admin UI) #1928 (9 shared files)
• feat(admin): add date-only content field #1365 (9 shared files)

This may cause merge conflicts or duplicated work. A maintainer will coordinate.