feat: age verification with an ID document (Didit), and closed registration (#4)

## Age verification with Didit

A new provider (`apps/api/src/age/didit.ts`) behind the existing vendor-neutral age interface. A person verifies once with an ID document, a passive liveness check and a face match; after that, all their linked IMVU accounts count as adult. The hub keeps only "over 18": never the document, photo or birth date.

- Webhooks are checked against Didit's signatures (the raw body or V2, with `-Previous` during secret rotation), and old ones are rejected. If the webhook has no decision, the hub fetches it from Didit.
- A later answer replaces an earlier one. An approval that's taken back (say, after a manual review) becomes `revoked`. A check still in review stays pending.
- Limits, for every provider: one unfinished check per person (starting again resumes it), at most 3 checks in 30 days, none once verified, and a monthly cap (`DIDIT_MONTHLY_LIMIT`, default 30: since 2026-11-01, Didit's free plan is $10 of credit a month, and a check costs $0.30).
- People are only ever sent back to the hub's website.
- The Account page gets an Age Verification card.
- Configuration: `AGE_PROVIDERS=imvu,didit`, `DIDIT_API_KEY`, `DIDIT_WORKFLOW_ID`, `DIDIT_WEBHOOK_SECRET`. The webhook is `<API_URL>/api/v1/age/webhook/didit`.

## Closed registration

Registration is open or closed. It's an admin's setting in the console, with its default from `REGISTRATION`.

- When it's closed, new accounts can only sign in until a moderator approves them, or declines them (which deletes the account).
- The website shows people who are waiting a waiting page, and the API treats them as signed out everywhere but `/me`.
- The console gets a Waiting count, a Waiting for approval filter, Approve and Decline on a person's page, and a Registration setting.
- The migration adds `user.approved` (existing accounts stay approved) and `hub_setting`.

## Testing

- New tests cover Didit (with a fake Didit server), the limits, revocation, return addresses and registration.
- `bun run test`: 35 pass. `bun run check-types` passes.
- Checked locally: the account, waiting, sign-up and console pages render.
- Not run against Didit itself yet. The sandbox workflow "T5DE Age Check" is published, and the next step is a real webhook once this is on staging.

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

## Age verification with Didit

A new provider (`apps/api/src/age/didit.ts`) behind the existing vendor-neutral age interface. A person verifies once with an ID document, a passive liveness check and a face match; after that, all their linked IMVU accounts count as adult. The hub keeps only "over 18": never the document, photo or birth date.

- Webhooks are checked against Didit's signatures (the raw body or V2, with `-Previous` during secret rotation), and old ones are rejected. If the webhook has no decision, the hub fetches it from Didit.
- A later answer replaces an earlier one. An approval that's taken back (say, after a manual review) becomes `revoked`. A check still in review stays pending.
- Limits, for every provider: one unfinished check per person (starting again resumes it), at most 3 checks in 30 days, none once verified, and a monthly cap (`DIDIT_MONTHLY_LIMIT`, default 30: since 2026-11-01, Didit's free plan is $10 of credit a month, and a check costs $0.30).
- People are only ever sent back to the hub's website.
- The Account page gets an Age Verification card.
- Configuration: `AGE_PROVIDERS=imvu,didit`, `DIDIT_API_KEY`, `DIDIT_WORKFLOW_ID`, `DIDIT_WEBHOOK_SECRET`. The webhook is `<API_URL>/api/v1/age/webhook/didit`.

## Closed registration

Registration is open or closed. It's an admin's setting in the console, with its default from `REGISTRATION`.

- When it's closed, new accounts can only sign in until a moderator approves them, or declines them (which deletes the account).
- The website shows people who are waiting a waiting page, and the API treats them as signed out everywhere but `/me`.
- The console gets a Waiting count, a Waiting for approval filter, Approve and Decline on a person's page, and a Registration setting.
- The migration adds `user.approved` (existing accounts stay approved) and `hub_setting`.

## Testing

- New tests cover Didit (with a fake Didit server), the limits, revocation, return addresses and registration.
- `bun run test`: 35 pass. `bun run check-types` passes.
- Checked locally: the account, waiting, sign-up and console pages render.
- Not run against Didit itself yet. The sandbox workflow "T5DE Age Check" is published, and the next step is a real webhook once this is on staging.

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

Co-authored-by: dhkatz <[email protected]>

apps/web/app/console/people/[id]/page.tsx

@@ -8,7 +8,7 @@ import { Input } from "@/components/ui/input";
 import { NativeSelect, NativeSelectOption } from "@/components/ui/native-select";
 import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "@/components/ui/table";
 import { api, ApiError, unwrap } from "@/lib/api";
-import { ban, setLinkCap, setRole, unban } from "../../actions";
+import { ban, decideAccount, setLinkCap, setRole, unban } from "../../actions";
 import { ConsoleNav, requireModerator } from "../../console-nav";
 
 export const metadata: Metadata = { title: "Person" };
@@ -35,11 +35,41 @@ export default async function PersonPage({ params }: { params: Promise<{ id: str
             joined <DateTime iso={person.createdAt} dateOnly />
           </span>
           {person.banned && <Tag tone="danger">banned: {person.banReason}</Tag>}
+          {!person.approved && <Tag tone="strong">waiting for approval</Tag>}
         </span>
       </PageHeader>
       <ConsoleNav />
 
       <div className="space-y-6">
+        {!person.approved && (
+          <Card>
+            <CardHeader>
+              <CardTitle>Waiting for Approval</CardTitle>
+              <CardDescription>
+                {person.email}. Until approved, they can only sign in. Declining deletes the account.
+              </CardDescription>
+            </CardHeader>
+            <CardContent>
+              <ActionForm action={decideAccount} fields={{ id: person.id }}>
+                <div className="flex gap-2">
+                  <SubmitButton name="decision" value="approve" pendingLabel="Approving…">
+                    Approve
+                  </SubmitButton>
+                  <SubmitButton
+                    name="decision"
+                    value="decline"
+                    variant="outline"
+                    pendingLabel="Declining…"
+                    confirm={`Decline ${person.username}? Their account is deleted.`}
+                  >
+                    Decline
+                  </SubmitButton>
+                </div>
+              </ActionForm>
+            </CardContent>
+          </Card>
+        )}
+
         <Card>
           <CardHeader>
             <CardTitle>IMVU accounts</CardTitle>