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/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>
+  );
+}