feat(observability+tts): OTel logs for backend/runner/ui; add kokoro-fastapi (GPU) and pocket-tts (CPU) to homelab

- otelsetup.Init now returns a *slog.Logger wired to the OTLP log exporter
  so all slog output is shipped to Loki with embedded trace IDs
- backend and runner both adopt the new OTel-bridged logger
- runner.runScrapeTask and runAudioTask now emit structured OTel spans
- ui/hooks.server.ts adds BatchLogRecordProcessor alongside existing trace exporter
- homelab: add kokoro-fastapi GPU service (ghcr.io/remsky/kokoro-fastapi-gpu)
  using deploy.resources.reservations for NVIDIA GPU, exposed internally on :8880
- homelab: add pocket-tts CPU service (ghcr.io/kyutai-labs/pocket-tts) on :8000
- runner KOKORO_URL hardcoded to http://kokoro-fastapi:8880 (fixes DNS failure
  for the stale kokoro.kalekber.cc hostname)

ui/package-lock.json

@@ -10,6 +10,7 @@
 			"dependencies": {
 				"@aws-sdk/client-s3": "^3.1005.0",
 				"@aws-sdk/s3-request-presigner": "^3.1005.0",
+				"@opentelemetry/exporter-logs-otlp-http": "^0.214.0",
 				"@opentelemetry/exporter-trace-otlp-http": "^0.214.0",
 				"@opentelemetry/resources": "^2.6.1",
 				"@opentelemetry/sdk-node": "^0.214.0",

ui/package.json

@@ -30,6 +30,7 @@
 	"dependencies": {
 		"@aws-sdk/client-s3": "^3.1005.0",
 		"@aws-sdk/s3-request-presigner": "^3.1005.0",
+		"@opentelemetry/exporter-logs-otlp-http": "^0.214.0",
 		"@opentelemetry/exporter-trace-otlp-http": "^0.214.0",
 		"@opentelemetry/resources": "^2.6.1",
 		"@opentelemetry/sdk-node": "^0.214.0",

ui/src/hooks.server.ts

@@ -9,10 +9,12 @@ import { createUserSession, touchUserSession, isSessionRevoked } from '$lib/serv
 import { drain as drainPresignCache } from '$lib/server/presignCache';
 import { NodeSDK } from '@opentelemetry/sdk-node';
 import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
+import { OTLPLogExporter } from '@opentelemetry/exporter-logs-otlp-http';
+import { BatchLogRecordProcessor } from '@opentelemetry/sdk-logs';
 import { resourceFromAttributes } from '@opentelemetry/resources';
 import { ATTR_SERVICE_NAME, ATTR_SERVICE_VERSION } from '@opentelemetry/semantic-conventions';
 
-// ─── OpenTelemetry server-side tracing ────────────────────────────────────────
+// ─── OpenTelemetry server-side tracing + logs ─────────────────────────────────
 // No-op when OTEL_EXPORTER_OTLP_ENDPOINT is unset (e.g. local dev).
 const otlpEndpoint = process.env.OTEL_EXPORTER_OTLP_ENDPOINT;
 if (otlpEndpoint) {
@@ -21,7 +23,12 @@ if (otlpEndpoint) {
 			[ATTR_SERVICE_NAME]: process.env.OTEL_SERVICE_NAME ?? 'ui',
 			[ATTR_SERVICE_VERSION]: pubEnv.PUBLIC_BUILD_VERSION ?? 'dev'
 		}),
-		traceExporter: new OTLPTraceExporter({ url: `${otlpEndpoint}/v1/traces` })
+		traceExporter: new OTLPTraceExporter({ url: `${otlpEndpoint}/v1/traces` }),
+		logRecordProcessors: [
+			new BatchLogRecordProcessor(
+				new OTLPLogExporter({ url: `${otlpEndpoint}/v1/logs` })
+			)
+		]
 	});
 	sdk.start();
 	process.once('SIGTERM', () => sdk.shutdown().catch(() => {}));