Add getUsageStats operation + hook

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

src/operations/usage_stats.gql

@@ -0,0 +1,26 @@
+query getUsageStats($days: Int! = 30) {
+  getUsageStats(days: $days) {
+    totalUsers
+    totalVideos
+    totalShots
+    totalRuns
+    windows {
+      label
+      newUsers
+      activeUsers
+      sessions
+      shots
+    }
+    daily {
+      day
+      newUsers
+      activeUsers
+      sessions
+      shots
+    }
+    processingLast24h {
+      status
+      count
+    }
+  }
+}

src/schema.gql

@@ -100,6 +100,7 @@ type Query {
     countRespectsLimit: Boolean! = false
   ): [ShotGQL!]!
   getShotsByIds(ids: [Int!]!): [ShotGQL!]!
+  getUsageStats(days: Int! = 30): UsageStatsGQL!
   getUser(userId: Int!): UserGQL
   doesUsernameExist(candidateUsername: String!): Boolean!
   getLoggedInUser: UserGQL
@@ -1168,6 +1169,37 @@ input CreatedAfter @oneOf {
   createdAt: DateTime
 }
 
+type UsageStatsGQL {
+  totalUsers: Int!
+  totalVideos: Int!
+  totalShots: Int!
+  totalRuns: Int!
+  windows: [UsageStatsWindowGQL!]!
+  daily: [UsageStatsDailyGQL!]!
+  processingLast24h: [ProcessingStatusCountGQL!]!
+}
+
+type UsageStatsWindowGQL {
+  label: String!
+  newUsers: Int!
+  activeUsers: Int!
+  sessions: Int!
+  shots: Int!
+}
+
+type UsageStatsDailyGQL {
+  day: Date!
+  newUsers: Int!
+  activeUsers: Int!
+  sessions: Int!
+  shots: Int!
+}
+
+type ProcessingStatusCountGQL {
+  status: String!
+  count: Int!
+}
+
 type UserRelationshipsResult {
   inquiringUser: UserGQL!
   relationships: [UserRelationship!]!