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

.woodpecker/docker.yaml

@@ -3,7 +3,7 @@ when:
     ref: refs/tags/v*
 
 steps:
-  - name: docker
+  - name: docker-api
     image: woodpeckerci/plugin-docker-buildx
     settings:
       registry: git.unkin.net
@@ -14,5 +14,17 @@ steps:
       tags:
         - ${CI_COMMIT_TAG}
         - latest
-      build_args:
-        - VERSION=${CI_COMMIT_TAG##v}
+
+  - name: docker-web
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      registry: git.unkin.net
+      repo: git.unkin.net/unkin/artifactapi-ui
+      dockerfile: ui/Dockerfile.ui
+      context: ui
+      username: droneci
+      password:
+        from_secret: DRONECI_PASSWORD
+      tags:
+        - ${CI_COMMIT_TAG}
+        - latest

.woodpecker/pre-commit.yaml

@@ -3,7 +3,7 @@ when:
 
 steps:
   - name: pre-commit
-    image: git.unkin.net/unkin/almalinux9-base:20260606
+    image: golang:1.25
     commands:
-      - uvx pre-commit run --all-files
-
+      - test -z "$(gofmt -l .)"
+      - go vet ./...

.woodpecker/test.yaml

@@ -3,6 +3,6 @@ when:
 
 steps:
   - name: test
-    image: git.unkin.net/unkin/almalinux9-base:20260606
+    image: golang:1.25
     commands:
-      - uvx --python 3.11 --with tox-uv tox
+      - go test -race -count=1 ./pkg/... ./internal/...