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/pages/Remotes.tsx

@@ -0,0 +1,113 @@
+import { useEffect, useState } from 'react';
+import { useNavigate } from 'react-router-dom';
+import { api } from '../api/client';
+import type { Remote } from '../api/types';
+import { Badge } from '../components/Badge';
+import { DataTable } from '../components/DataTable';
+import './Remotes.css';
+
+const typeColors: Record<string, 'blue' | 'green' | 'yellow' | 'red' | 'default'> = {
+  docker: 'blue',
+  helm: 'green',
+  rpm: 'yellow',
+  pypi: 'blue',
+  npm: 'red',
+  generic: 'default',
+  alpine: 'green',
+  puppet: 'yellow',
+  terraform: 'blue',
+  goproxy: 'green',
+};
+
+export function Remotes() {
+  const navigate = useNavigate();
+  const [remotes, setRemotes] = useState<Remote[]>([]);
+  const [filter, setFilter] = useState('');
+  const [typeFilter, setTypeFilter] = useState('');
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    api.listRemotes()
+      .then(r => setRemotes(r || []))
+      .finally(() => setLoading(false));
+  }, []);
+
+  const types = [...new Set(remotes.map(r => r.package_type))].sort();
+
+  const filtered = remotes.filter(r => {
+    if (typeFilter && r.package_type !== typeFilter) return false;
+    if (filter && !r.name.toLowerCase().includes(filter.toLowerCase())) return false;
+    return true;
+  });
+
+  return (
+    <div>
+      <h1 className="page-title">Remotes</h1>
+
+      <div className="remotes-toolbar">
+        <input
+          className="search-input"
+          placeholder="Filter by name..."
+          value={filter}
+          onChange={e => setFilter(e.target.value)}
+        />
+        <select
+          className="type-select"
+          value={typeFilter}
+          onChange={e => setTypeFilter(e.target.value)}
+        >
+          <option value="">All types</option>
+          {types.map(t => (
+            <option key={t} value={t}>{t}</option>
+          ))}
+        </select>
+        <span className="result-count">{filtered.length} remotes</span>
+      </div>
+
+      {loading ? (
+        <div className="loading">Loading...</div>
+      ) : (
+        <DataTable
+          columns={[
+            {
+              key: 'name',
+              header: 'Name',
+              render: (r: Remote) => <span className="mono">{r.name}</span>,
+            },
+            {
+              key: 'type',
+              header: 'Type',
+              render: (r: Remote) => (
+                <Badge variant={typeColors[r.package_type] || 'default'}>
+                  {r.package_type}
+                </Badge>
+              ),
+              width: '110px',
+            },
+            {
+              key: 'description',
+              header: 'Description',
+              render: (r: Remote) => r.description || <span className="text-muted">—</span>,
+            },
+            {
+              key: 'ttl',
+              header: 'Mutable TTL',
+              render: (r: Remote) => <span className="mono">{r.mutable_ttl}s</span>,
+              width: '110px',
+            },
+            {
+              key: 'managed',
+              header: 'Managed',
+              render: (r: Remote) =>
+                r.managed_by ? <Badge variant="blue">{r.managed_by}</Badge> : <span className="text-muted">—</span>,
+              width: '100px',
+            },
+          ]}
+          data={filtered}
+          emptyMessage="No remotes match"
+          onRowClick={(r) => navigate(`/remotes/${r.name}`)}
+        />
+      )}
+    </div>
+  );
+}