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

ui/src/components/Badge.css

@@ -0,0 +1,35 @@
+.badge {
+  display: inline-block;
+  padding: 2px 8px;
+  border-radius: 4px;
+  font-size: 0.75em;
+  font-weight: 600;
+  font-family: var(--font-mono);
+  text-transform: uppercase;
+  letter-spacing: 0.03em;
+}
+
+.badge-default {
+  background: var(--bg-elevated);
+  color: var(--text-muted);
+}
+
+.badge-green {
+  background: rgba(34, 197, 94, 0.15);
+  color: var(--green);
+}
+
+.badge-yellow {
+  background: rgba(234, 179, 8, 0.15);
+  color: var(--yellow);
+}
+
+.badge-red {
+  background: rgba(239, 68, 68, 0.15);
+  color: var(--red);
+}
+
+.badge-blue {
+  background: rgba(59, 130, 246, 0.15);
+  color: var(--accent);
+}

ui/src/components/Badge.tsx

@@ -0,0 +1,10 @@
+import './Badge.css';
+
+interface BadgeProps {
+  children: React.ReactNode;
+  variant?: 'default' | 'green' | 'yellow' | 'red' | 'blue';
+}
+
+export function Badge({ children, variant = 'default' }: BadgeProps) {
+  return <span className={`badge badge-${variant}`}>{children}</span>;
+}

ui/src/components/DataTable.css

@@ -0,0 +1,50 @@
+.data-table-wrap {
+  overflow-x: auto;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: var(--bg-surface);
+}
+
+.data-table {
+  width: 100%;
+  border-collapse: collapse;
+  font-size: 0.9em;
+}
+
+.data-table th {
+  text-align: left;
+  padding: 10px 14px;
+  font-size: 0.8em;
+  font-weight: 600;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 0.04em;
+  border-bottom: 1px solid var(--border);
+  background: var(--bg-elevated);
+  white-space: nowrap;
+}
+
+.data-table td {
+  padding: 10px 14px;
+  border-bottom: 1px solid var(--border);
+  color: var(--text);
+  vertical-align: middle;
+}
+
+.data-table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.data-table tbody tr:hover {
+  background: var(--bg-elevated);
+}
+
+.data-table tbody tr.clickable {
+  cursor: pointer;
+}
+
+.data-table-empty {
+  text-align: center;
+  color: var(--text-muted);
+  padding: 32px 14px !important;
+}

ui/src/components/DataTable.tsx

@@ -0,0 +1,54 @@
+import './DataTable.css';
+
+interface Column<T> {
+  key: string;
+  header: string;
+  render: (item: T) => React.ReactNode;
+  width?: string;
+}
+
+interface DataTableProps<T> {
+  columns: Column<T>[];
+  data: T[];
+  emptyMessage?: string;
+  onRowClick?: (item: T) => void;
+}
+
+export function DataTable<T>({ columns, data, emptyMessage = 'No data', onRowClick }: DataTableProps<T>) {
+  return (
+    <div className="data-table-wrap">
+      <table className="data-table">
+        <thead>
+          <tr>
+            {columns.map(col => (
+              <th key={col.key} style={col.width ? { width: col.width } : undefined}>
+                {col.header}
+              </th>
+            ))}
+          </tr>
+        </thead>
+        <tbody>
+          {data.length === 0 ? (
+            <tr>
+              <td colSpan={columns.length} className="data-table-empty">
+                {emptyMessage}
+              </td>
+            </tr>
+          ) : (
+            data.map((item, i) => (
+              <tr
+                key={i}
+                onClick={onRowClick ? () => onRowClick(item) : undefined}
+                className={onRowClick ? 'clickable' : ''}
+              >
+                {columns.map(col => (
+                  <td key={col.key}>{col.render(item)}</td>
+                ))}
+              </tr>
+            ))
+          )}
+        </tbody>
+      </table>
+    </div>
+  );
+}

ui/src/components/StatsCard.css

@@ -0,0 +1,29 @@
+.stats-card {
+  background: var(--bg-surface);
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  padding: 20px;
+  min-width: 160px;
+}
+
+.stats-label {
+  font-size: 0.8em;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  margin-bottom: 6px;
+}
+
+.stats-value {
+  font-size: 1.8em;
+  font-weight: 700;
+  color: var(--text-bright);
+  font-family: var(--font-mono);
+  line-height: 1.2;
+}
+
+.stats-sub {
+  font-size: 0.8em;
+  color: var(--text-muted);
+  margin-top: 4px;
+}

ui/src/components/StatsCard.tsx

@@ -0,0 +1,17 @@
+import './StatsCard.css';
+
+interface StatsCardProps {
+  label: string;
+  value: string | number;
+  sub?: string;
+}
+
+export function StatsCard({ label, value, sub }: StatsCardProps) {
+  return (
+    <div className="stats-card">
+      <div className="stats-label">{label}</div>
+      <div className="stats-value">{value}</div>
+      {sub && <div className="stats-sub">{sub}</div>}
+    </div>
+  );
+}

ui/src/components/format.ts

@@ -0,0 +1,29 @@
+export function formatBytes(bytes: number): string {
+  if (bytes === 0) return '0 B';
+  const units = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(1024));
+  const val = bytes / Math.pow(1024, i);
+  return `${val.toFixed(i === 0 ? 0 : 1)} ${units[i]}`;
+}
+
+export function formatNumber(n: number): string {
+  return n.toLocaleString();
+}
+
+export function timeAgo(dateStr: string): string {
+  const seconds = Math.floor((Date.now() - new Date(dateStr).getTime()) / 1000);
+  if (seconds < 60) return `${seconds}s ago`;
+  const minutes = Math.floor(seconds / 60);
+  if (minutes < 60) return `${minutes}m ago`;
+  const hours = Math.floor(minutes / 60);
+  if (hours < 24) return `${hours}h ago`;
+  const days = Math.floor(hours / 24);
+  return `${days}d ago`;
+}
+
+export function truncateHash(hash: string, len = 12): string {
+  if (hash.startsWith('sha256:')) {
+    return hash.slice(0, 7 + len);
+  }
+  return hash.slice(0, len);
+}