Feat/v3 go rewrite (#47)

Complete rewrite of ArtifactAPI from Python/FastAPI to Go as a single binary.

Core engine:
- 10 package providers: generic, docker, helm, pypi, npm, rpm, alpine,
  puppet, terraform, goproxy — each with built-in mutable patterns
- Content-addressable storage (SHA256 dedup across all remotes)
- Three-tier caching: Redis (TTL/locks) → S3/MinIO (blobs) → upstream
- Classifier with allowlist/blocklist per-remote (empty = allow all)
- Circuit breaker, conditional revalidation, stale-on-error
- Background garbage collection for orphaned blobs
- Access logging to PostgreSQL

API:
- v1 proxy endpoints (backwards compatible)
- v2 management API: CRUD remotes/virtuals, object browser, stats,
  health, SSE events, probe/test endpoint
- Virtual repos with index merging (Helm YAML + PyPI HTML)

Frontend (React + Vite, separate Dockerfile):
- Dashboard with stats, health indicators, top remotes
- Remotes list with type filter, remote detail with config/patterns
- Object browser with pagination and evict
- Test Remote page: probe any remote path, see headers/size/timing
- Virtuals page with expandable member lists

TUI (Bubble Tea):
- Dashboard, remotes list/detail, object browser, virtuals
- Vim-style navigation, artifactapi tui --endpoint <url>

Infrastructure:
- S3 client supports MinIO, Ceph RGW, AWS S3 (minio-go)
- PostgreSQL schema with migrations
- Docker Compose: API + UI + Postgres 17 + Redis 7 + MinIO
- Makefile with Go version check, build/test/lint/fmt/e2e targets
- Distroless Docker image (~15MB)

Testing:
- Unit tests for models, classifier, providers, mergers
- E2E tests with testcontainers-go (real Postgres/Redis/MinIO)

Terraform config:
- All 40 production remotes + helm virtual as HCL
- Provider repo: terraform-provider-artifactapi v0.0.1 (separate)

---------

Co-authored-by: Ben Vincent <ben@unkin.net>
Reviewed-on: #47

pkg/models/artifact.go

@@ -0,0 +1,38 @@
+package models
+
+import "time"
+
+type Blob struct {
+	ContentHash string    `json:"content_hash"`
+	S3Key       string    `json:"s3_key"`
+	SizeBytes   int64     `json:"size_bytes"`
+	ContentType string    `json:"content_type"`
+	CreatedAt   time.Time `json:"created_at"`
+}
+
+type Artifact struct {
+	ID                   int64      `json:"id"`
+	RemoteName           string     `json:"remote_name"`
+	Path                 string     `json:"path"`
+	ContentHash          string     `json:"content_hash"`
+	UpstreamETag         string     `json:"upstream_etag,omitempty"`
+	UpstreamLastModified *time.Time `json:"upstream_last_modified,omitempty"`
+	FirstSeenAt          time.Time  `json:"first_seen_at"`
+	LastFetchedAt        time.Time  `json:"last_fetched_at"`
+	LastAccessedAt       time.Time  `json:"last_accessed_at"`
+	FetchCount           int64      `json:"fetch_count"`
+	AccessCount          int64      `json:"access_count"`
+	SizeBytes            int64      `json:"size_bytes"`
+	ContentType          string     `json:"content_type,omitempty"`
+}
+
+type AccessLogEntry struct {
+	ID         int64     `json:"id"`
+	RemoteName string    `json:"remote_name"`
+	Path       string    `json:"path"`
+	CacheHit   bool      `json:"cache_hit"`
+	SizeBytes  int64     `json:"size_bytes"`
+	UpstreamMS int       `json:"upstream_ms"`
+	ClientIP   string    `json:"client_ip"`
+	CreatedAt  time.Time `json:"created_at"`
+}

pkg/models/local.go

@@ -0,0 +1,11 @@
+package models
+
+import "time"
+
+type LocalFile struct {
+	ID          int64     `json:"id"`
+	RepoName    string    `json:"repo_name"`
+	FilePath    string    `json:"file_path"`
+	ContentHash string    `json:"content_hash"`
+	CreatedAt   time.Time `json:"created_at"`
+}

pkg/models/package_type.go

@@ -0,0 +1,47 @@
+package models
+
+import "fmt"
+
+type PackageType string
+
+const (
+	PackageGeneric   PackageType = "generic"
+	PackageDocker    PackageType = "docker"
+	PackageHelm      PackageType = "helm"
+	PackagePyPI      PackageType = "pypi"
+	PackageNPM       PackageType = "npm"
+	PackageRPM       PackageType = "rpm"
+	PackageAlpine    PackageType = "alpine"
+	PackagePuppet    PackageType = "puppet"
+	PackageTerraform PackageType = "terraform"
+	PackageGoProxy   PackageType = "goproxy"
+)
+
+var validPackageTypes = map[PackageType]bool{
+	PackageGeneric:   true,
+	PackageDocker:    true,
+	PackageHelm:      true,
+	PackagePyPI:      true,
+	PackageNPM:       true,
+	PackageRPM:       true,
+	PackageAlpine:    true,
+	PackagePuppet:    true,
+	PackageTerraform: true,
+	PackageGoProxy:   true,
+}
+
+func (p PackageType) Valid() bool {
+	return validPackageTypes[p]
+}
+
+func (p PackageType) String() string {
+	return string(p)
+}
+
+func ParsePackageType(s string) (PackageType, error) {
+	pt := PackageType(s)
+	if !pt.Valid() {
+		return "", fmt.Errorf("unknown package type: %q", s)
+	}
+	return pt, nil
+}

pkg/models/package_type_test.go

@@ -0,0 +1,58 @@
+package models_test
+
+import (
+	"testing"
+
+	"git.unkin.net/unkin/artifactapi/pkg/models"
+)
+
+func TestPackageTypeValid(t *testing.T) {
+	valid := []models.PackageType{
+		models.PackageGeneric,
+		models.PackageDocker,
+		models.PackageHelm,
+		models.PackagePyPI,
+		models.PackageNPM,
+		models.PackageRPM,
+		models.PackageAlpine,
+		models.PackagePuppet,
+		models.PackageTerraform,
+		models.PackageGoProxy,
+	}
+	for _, pt := range valid {
+		if !pt.Valid() {
+			t.Errorf("expected %q to be valid", pt)
+		}
+	}
+}
+
+func TestPackageTypeInvalid(t *testing.T) {
+	invalid := []string{"", "bogus", "Docker", "HELM"}
+	for _, s := range invalid {
+		pt := models.PackageType(s)
+		if pt.Valid() {
+			t.Errorf("expected %q to be invalid", s)
+		}
+	}
+}
+
+func TestParsePackageType(t *testing.T) {
+	pt, err := models.ParsePackageType("docker")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if pt != models.PackageDocker {
+		t.Errorf("expected docker, got %q", pt)
+	}
+
+	_, err = models.ParsePackageType("nope")
+	if err == nil {
+		t.Fatal("expected error for unknown type")
+	}
+}
+
+func TestPackageTypeString(t *testing.T) {
+	if models.PackageGoProxy.String() != "goproxy" {
+		t.Errorf("expected 'goproxy', got %q", models.PackageGoProxy.String())
+	}
+}

pkg/models/remote.go

@@ -0,0 +1,40 @@
+package models
+
+import "time"
+
+type Remote struct {
+	Name        string      `json:"name"`
+	PackageType PackageType `json:"package_type"`
+	BaseURL     string      `json:"base_url"`
+	Description string      `json:"description,omitempty"`
+	Username    string      `json:"-"`
+	Password    string      `json:"-"`
+
+	ImmutableTTL int  `json:"immutable_ttl"`
+	MutableTTL   int  `json:"mutable_ttl"`
+	CheckMutable bool `json:"check_mutable"`
+
+	Patterns          []string `json:"patterns,omitempty"`
+	Blocklist         []string `json:"blocklist,omitempty"`
+	MutablePatterns   []string `json:"mutable_patterns,omitempty"`
+	ImmutablePatterns []string `json:"immutable_patterns,omitempty"`
+
+	BanTagsEnabled bool     `json:"ban_tags_enabled,omitempty"`
+	BanTags        []string `json:"ban_tags,omitempty"`
+
+	QuarantineEnabled bool `json:"quarantine_enabled,omitempty"`
+	QuarantineDays    int  `json:"quarantine_days,omitempty"`
+
+	StaleOnError bool `json:"stale_on_error"`
+
+	ReleasesRemote string `json:"releases_remote,omitempty"`
+	ManagedBy      string `json:"managed_by,omitempty"`
+
+	CreatedAt time.Time `json:"created_at"`
+	UpdatedAt time.Time `json:"updated_at"`
+}
+
+type RemoteWithStats struct {
+	Remote
+	Stats RemoteStats `json:"stats"`
+}

pkg/models/stats.go

@@ -0,0 +1,23 @@
+package models
+
+type RemoteStats struct {
+	ObjectCount    int64   `json:"object_count"`
+	TotalBytes     int64   `json:"total_bytes"`
+	HitRate30d     float64 `json:"hit_rate_30d"`
+	Requests30d    int64   `json:"requests_30d"`
+	BandwidthSaved int64   `json:"bandwidth_saved_30d"`
+}
+
+type OverviewStats struct {
+	TotalRemotes      int   `json:"total_remotes"`
+	TotalObjects      int64 `json:"total_objects"`
+	TotalBytes        int64 `json:"total_bytes"`
+	TotalBlobsDeduped int64 `json:"total_blobs_deduped"`
+	BandwidthSaved30d int64 `json:"bandwidth_saved_30d"`
+}
+
+type RemoteHealth struct {
+	Status              string `json:"status"` // healthy, degraded, down
+	LastError           string `json:"last_error,omitempty"`
+	ConsecutiveFailures int    `json:"consecutive_failures"`
+}

pkg/models/virtual.go

@@ -0,0 +1,13 @@
+package models
+
+import "time"
+
+type Virtual struct {
+	Name        string      `json:"name"`
+	PackageType PackageType `json:"package_type"`
+	Description string      `json:"description,omitempty"`
+	Members     []string    `json:"members"`
+	ManagedBy   string      `json:"managed_by,omitempty"`
+	CreatedAt   time.Time   `json:"created_at"`
+	UpdatedAt   time.Time   `json:"updated_at"`
+}