Add real-time log monitoring and system stats dashboard

Implements a comprehensive monitoring system for the admin interface:

Backend:
- New monitoring package with Redis ring buffer for log storage
- Zerolog MultiWriter to capture logs to Redis
- System stats collection (CPU, memory, disk, goroutines, GC)
- HTTP metrics middleware (request counts, latency, error rates)
- Asynq queue stats for worker process
- WebSocket endpoint for real-time log streaming
- Admin auth middleware now accepts token in query params (for WebSocket)

Frontend:
- New monitoring page with tabs (Overview, Logs, API Stats, Worker Stats)
- Real-time log viewer with level filtering and search
- System stats cards showing CPU, memory, goroutines, uptime
- HTTP endpoint statistics table
- Asynq queue depth visualization
- Enable/disable monitoring toggle in settings

Memory safeguards:
- Max 200 unique endpoints tracked
- Hourly stats reset to prevent unbounded growth
- Max 1000 log entries in ring buffer
- Max 1000 latency samples for P95 calculation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

go.mod

@@ -9,14 +9,19 @@ require (
 	github.com/gin-gonic/gin v1.10.1
 	github.com/golang-jwt/jwt/v5 v5.3.0
 	github.com/google/uuid v1.6.0
+	github.com/gorilla/websocket v1.5.3
 	github.com/hibiken/asynq v0.25.1
 	github.com/jung-kurt/gofpdf v1.16.2
+	github.com/nicksnyder/go-i18n/v2 v2.6.0
 	github.com/redis/go-redis/v9 v9.17.1
 	github.com/rs/zerolog v1.34.0
+	github.com/shirou/gopsutil/v3 v3.24.5
 	github.com/shopspring/decimal v1.4.0
+	github.com/sideshow/apns2 v0.25.0
 	github.com/spf13/viper v1.20.1
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/crypto v0.40.0
+	golang.org/x/text v0.27.0
 	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df
 	gorm.io/driver/postgres v1.6.0
 	gorm.io/driver/sqlite v1.6.0
@@ -24,47 +29,22 @@ require (
 )
 
 require (
-	cel.dev/expr v0.23.1 // indirect
-	cloud.google.com/go v0.121.0 // indirect
-	cloud.google.com/go/auth v0.16.1 // indirect
-	cloud.google.com/go/auth/oauth2adapt v0.2.8 // indirect
-	cloud.google.com/go/compute/metadata v0.6.0 // indirect
-	cloud.google.com/go/firestore v1.18.0 // indirect
-	cloud.google.com/go/iam v1.5.2 // indirect
-	cloud.google.com/go/longrunning v0.6.7 // indirect
-	cloud.google.com/go/monitoring v1.24.2 // indirect
-	cloud.google.com/go/storage v1.53.0 // indirect
-	firebase.google.com/go/v4 v4.18.0 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/detectors/gcp v1.27.0 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/exporter/metric v0.51.0 // indirect
-	github.com/GoogleCloudPlatform/opentelemetry-operations-go/internal/resourcemapping v0.51.0 // indirect
-	github.com/MicahParks/keyfunc v1.9.0 // indirect
 	github.com/bytedance/sonic v1.14.0 // indirect
 	github.com/bytedance/sonic/loader v0.3.0 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
-	github.com/cncf/xds/go v0.0.0-20250501225837-2ac532fd4443 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
-	github.com/envoyproxy/go-control-plane/envoy v1.32.4 // indirect
-	github.com/envoyproxy/protoc-gen-validate v1.2.1 // indirect
-	github.com/felixge/httpsnoop v1.0.4 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
-	github.com/go-jose/go-jose/v4 v4.0.5 // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
-	github.com/go-logr/stdr v1.2.2 // indirect
+	github.com/go-ole/go-ole v1.2.6 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.23.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/goccy/go-json v0.10.5 // indirect
 	github.com/golang-jwt/jwt/v4 v4.5.2 // indirect
-	github.com/golang/protobuf v1.5.4 // indirect
-	github.com/google/s2a-go v0.1.9 // indirect
-	github.com/googleapis/enterprise-certificate-proxy v0.3.6 // indirect
-	github.com/googleapis/gax-go/v2 v2.14.1 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
 	github.com/jackc/pgx/v5 v5.6.0 // indirect
@@ -74,50 +54,34 @@ require (
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
+	github.com/lufia/plan9stats v0.0.0-20211012122336-39d0f177ccd0 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-sqlite3 v2.0.3+incompatible // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
-	github.com/nicksnyder/go-i18n/v2 v2.6.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
-	github.com/planetscale/vtprotobuf v0.6.1-0.20240319094008-0393e58bdf10 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/power-devops/perfstat v0.0.0-20210106213030-5aafc221ea8c // indirect
 	github.com/robfig/cron/v3 v3.0.1 // indirect
 	github.com/rogpeppe/go-internal v1.13.1 // indirect
 	github.com/sagikazarmark/locafero v0.9.0 // indirect
-	github.com/sideshow/apns2 v0.25.0 // indirect
+	github.com/shoenig/go-m1cpu v0.1.6 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
 	github.com/spf13/afero v1.14.0 // indirect
 	github.com/spf13/cast v1.10.0 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
-	github.com/spiffe/go-spiffe/v2 v2.5.0 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
+	github.com/tklauser/go-sysconf v0.3.12 // indirect
+	github.com/tklauser/numcpus v0.6.1 // indirect
 	github.com/twitchyliquid64/golang-asm v0.15.1 // indirect
 	github.com/ugorji/go/codec v1.3.0 // indirect
-	github.com/zeebo/errs v1.4.0 // indirect
-	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
-	go.opentelemetry.io/contrib/detectors/gcp v1.35.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc v0.60.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.60.0 // indirect
-	go.opentelemetry.io/otel v1.35.0 // indirect
-	go.opentelemetry.io/otel/metric v1.35.0 // indirect
-	go.opentelemetry.io/otel/sdk v1.35.0 // indirect
-	go.opentelemetry.io/otel/sdk/metric v1.35.0 // indirect
-	go.opentelemetry.io/otel/trace v1.35.0 // indirect
+	github.com/yusufpapurcu/wmi v1.2.4 // indirect
 	golang.org/x/arch v0.12.0 // indirect
 	golang.org/x/net v0.42.0 // indirect
-	golang.org/x/oauth2 v0.30.0 // indirect
 	golang.org/x/sync v0.16.0 // indirect
 	golang.org/x/sys v0.34.0 // indirect
-	golang.org/x/text v0.27.0 // indirect
 	golang.org/x/time v0.11.0 // indirect
-	google.golang.org/api v0.231.0 // indirect
-	google.golang.org/appengine/v2 v2.0.6 // indirect
-	google.golang.org/genproto v0.0.0-20250505200425-f936aa4a68b2 // indirect
-	google.golang.org/genproto/googleapis/api v0.0.0-20250505200425-f936aa4a68b2 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20250505200425-f936aa4a68b2 // indirect
-	google.golang.org/grpc v1.72.0 // indirect
 	google.golang.org/protobuf v1.36.9 // indirect
 	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect