[claude] API observability — structured logging + /api/metrics endpoint (#57) (#87)

artifacts/api-server/src/lib/metrics.ts

@@ -1,6 +1,7 @@
 import { db, jobs, invoices } from "@workspace/db";
 import { sql } from "drizzle-orm";
 import { latencyHistogram, type BucketStats } from "./histogram.js";
+import { requestCounters, type RequestCountsSnapshot } from "./request-counters.js";
 
 export interface JobStateCounts {
   awaiting_eval: number;
@@ -12,6 +13,7 @@ export interface JobStateCounts {
 
 export interface MetricsSnapshot {
   uptime_s: number;
+  http: RequestCountsSnapshot;
   jobs: {
     total: number;
     by_state: JobStateCounts;
@@ -94,6 +96,7 @@ export class MetricsService {
 
     return {
       uptime_s: Math.floor((Date.now() - START_TIME) / 1000),
+      http: requestCounters.snapshot(),
       jobs: {
         total: jobsTotal,
         by_state: byState,