docs(analytics,jobs): Work Order 3 batch 4 — device usage, popular books, job create/status

DeviceUsageResponse / PopularBooksResponse / services.JobResult pinned by
type; jobs create uses an inline anonymous request struct (RawMessage pin).
Two UNVERIFIED markers recorded (analytics date-range params, facet value
element shape).

internal/docs/schema.go

@@ -238,4 +238,20 @@ var Schemas = map[string]Schema{
 	"GET /api/media-items/filter-count": {
 		Response: json.RawMessage(`{"count": 0}`),
 	},
+
+	// --- analytics + jobs (batch 4) ---
+	"GET /api/analytics/device-usage": {
+		Response: handlers.DeviceUsageResponse{},
+	},
+	"GET /api/analytics/popular-books": {
+		Response: handlers.PopularBooksResponse{},
+	},
+	"POST /api/jobs": {
+		// Inline anonymous request struct {type, params} — pinned by sample.
+		Request:  json.RawMessage(`{"type": "", "params": {}}`),
+		Response: json.RawMessage(`{"message": "", "job_id": "", "type": "", "status": ""}`),
+	},
+	"GET /api/jobs/:jobId": {
+		Response: services.JobResult{},
+	},
 }