feat(WP-0010): IHF Phase 9 — External API Surface and Consumer SDKs

Delivers the full Phase 9 external API layer:

- Versioned REST API (/api/v2/) with OpenAPI 3.1 spec; enum arrays for
  widget_type, event_type, annotation category drawn live from registry tables
- OAuth 2.0 client credentials flow (/api/v2/token); hub:*:write scopes
  gated on active HubCapabilityManifest FK
- API key management: SHA256-hashed tokens, key_prefix for display,
  one-time reveal on creation, revocation support
- TypeScript and Python consumer SDKs generated from registry tables
  (/api/v2/sdk/ihf-client.ts, /api/v2/sdk/ihf-client.py)
- Webhook delivery: HMAC-SHA256 signing, append-only webhook_deliveries,
  fire-and-forget dispatch via forkIO, 3-retry logic
- Admin API dashboard with 24h stats (request count, error rate, last seen)
- Rate limiting (per-minute) and daily quota enforcement via api_request_log
- Schema migration: api_consumers, api_keys, webhook_subscriptions (CHECK
  constraint on 6 framework lifecycle topics), webhook_deliveries
  (append-only trigger), api_request_log
- ARCHITECTURE-LAYERS.md scorecard: 3.34 → 3.41 (approaching Strong)
- contracts/functional/interaction-reporting-v1.md extended with Phase 9
  endpoint catalogue and 422 validation error format

GAAF: no bare TEXT discriminators; webhook event_type uses CHECK constraint
over 6 allowed framework lifecycle topic strings (not widget event types).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Web/View/ApiDashboard/Show.hs

@@ -0,0 +1,75 @@
+module Web.View.ApiDashboard.Show where
+
+import Web.Types
+import Generated.Types
+import IHP.Prelude
+import IHP.ViewPrelude
+import Data.Maybe (fromMaybe)
+
+data ConsumerStats = ConsumerStats
+    { consumer    :: !ApiConsumer
+    , requests24h :: !Int
+    , errorRate   :: !Double    -- fraction 0..1
+    , lastSeen    :: !(Maybe UTCTime)
+    }
+
+data ShowView = ShowView { stats :: ![ConsumerStats] }
+
+instance View ShowView where
+    html ShowView { .. } = [hsx|
+        <div class="flex items-center justify-between mb-6">
+            <div>
+                <h1 class="text-2xl font-semibold">API Usage Dashboard</h1>
+                <p class="text-sm text-gray-500 mt-1">Per-consumer request metrics (last 24 hours)</p>
+            </div>
+            <a href={ApiConsumersAction} class="text-sm text-gray-500 hover:text-gray-700">← Consumers</a>
+        </div>
+        {if null stats
+            then [hsx|<p class="text-sm text-gray-400">No API activity yet.</p>|]
+            else statsTable}
+    |]
+      where
+        statsTable = [hsx|
+            <div class="bg-white rounded-lg border border-gray-200 overflow-hidden">
+                <table class="w-full text-sm">
+                    <thead class="bg-gray-50 border-b">
+                        <tr>
+                            <th class="text-left px-4 py-3 font-medium text-gray-600">Consumer</th>
+                            <th class="text-right px-4 py-3 font-medium text-gray-600">Req (24h)</th>
+                            <th class="text-right px-4 py-3 font-medium text-gray-600">Error Rate</th>
+                            <th class="text-left px-4 py-3 font-medium text-gray-600">Last Seen</th>
+                            <th class="text-left px-4 py-3 font-medium text-gray-600">Manifest</th>
+                        </tr>
+                    </thead>
+                    <tbody class="divide-y divide-gray-100">
+                        {forEach stats renderRow}
+                    </tbody>
+                </table>
+            </div>
+        |]
+        renderRow ConsumerStats { .. } = [hsx|
+            <tr class="hover:bg-gray-50">
+                <td class="px-4 py-3 font-medium">
+                    <a href={ShowApiConsumerAction consumer.id} class="text-indigo-600 hover:underline">
+                        {consumer.name}
+                    </a>
+                </td>
+                <td class="px-4 py-3 text-right">{show requests24h}</td>
+                <td class="px-4 py-3 text-right">
+                    <span class={errorClass errorRate}>
+                        {formatErrorRate errorRate}%
+                    </span>
+                </td>
+                <td class="px-4 py-3 text-gray-500 text-xs">
+                    {maybe "never" show lastSeen}
+                </td>
+                <td class="px-4 py-3 text-gray-500">
+                    {if isJust consumer.hubCapabilityManifestId then "✓" else "–" :: Text}
+                </td>
+            </tr>
+        |]
+        errorClass rate
+            | rate > 0.1 = "text-red-600 font-medium" :: Text
+            | rate > 0.02 = "text-amber-600"
+            | otherwise  = "text-gray-600"
+        formatErrorRate rate = show (round (rate * 100) :: Int)