feat(services): multi-domain, DNS check, maintenance + basic-auth gates (C2)

service_domains table holds the full hostname set; services.domain stays
the derived default and is synced on every domain write. Runtime spec
carries all domains into a multi-Host Traefik rule plus access gates.

- GET|POST /services/:id/domains, DELETE + POST /:domain_id/default
- GET /services/:id/domains/check — DNS preflight vs public_ip/base_url
  (ok | wrong-target | pending), stamps last_checked_at
- maintenance_mode → Traefik redirectregex to /api/v1/maintenance
  (base_url/BASE_URL setting; falls back to noop@internal offline)
- basic_auth [{username,password}] → bcrypt htpasswd on the label;
  responses return usernames only
- First domain auto-defaults; domain="" via PUT clears all domains
- CLI: services domains list|add|remove|default|check, update
  --maintenance/--basic-auth; MCP: 5 domain tools + update args
- Settings UI: Domains card (CRUD + DNS check badges) + Access card
- Fixes latent C1 bug: PUT without volumes 500'd — nil []byte sent as
  bytea, not NULL; COALESCE needs untyped nil + ::jsonb cast

Verified live: domain CRUD + default sync, pending/wrong-target checks,
bcrypt htpasswd and both middlewares on the deployed container's labels.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/frontend/src/generated/docs-snapshot.ts

@@ -40,7 +40,7 @@ export const bundledDocs: BundledDoc[] = [
     "path": "guides/CLI.md",
     "section": "guides",
     "title": "Containr CLI",
-    "markdown": "# Containr CLI\n\nThe CLI controls every part of a Containr instance — the same API surface\nthe web UI uses. Build it with `scripts/build-cli.sh` or\n`go build ./cmd/cli` from `app/backend`.\n\n## Authentication\n\nCreate a personal access token in the web UI under\n**Settings → Personal Access Tokens** (or `containr tokens create`), then:\n\n```bash\ncontainr auth login cnp_...                      # verify + store\ncontainr auth login cnp_... --url https://containr.example.com\ncontainr auth login cnp_... --name production    # named profile\ncontainr auth status                             # show active profile + identity\ncontainr auth logout\n```\n\nResolution order for every command: `--token`/`--api-url` flags >\n`CONTAINR_TOKEN`/`CONTAINR_API_URL` env > active profile >\n`http://localhost:8080/api/v1`. The active profile is `--profile` >\n`CONTAINR_PROFILE` > `current_profile` in `~/.containr.yaml`.\n\n## Output and scripting\n\n- `--json` prints the raw API response — safe to pipe and parse.\n- `--yes` / `-y` skips confirmation on destructive commands (delete,\n  revoke, restore, failover). Non-interactive shells refuse destructive\n  commands without it.\n- Exit codes are stable: `0` ok, `1` error, `2` auth/permission,\n  `3` not found, `4` validation, `5` unreachable.\n\n## Commands\n\n```\nauth login|logout|status         token auth and profiles\ntokens list|create|revoke        personal access tokens\nprojects list|get|create|delete\nservices list|get|create|update|delete|start|stop|restart|redeploy\nvolumes list|delete              docker volume inventory + cleanup (admin)\ndeploy <service-id>              trigger a deployment (--no-cache, --commit-hash, --branch)\ndeployments list|get|logs|rollback|cancel\nlogs <service-id> [--follow]     runtime logs (SSE follow)\nexec <service-id> -- <cmd>       one-off container command\nvariables list|set|unset         env vars (secrets masked; --redeploy applies them)\ndatabases list|get|create|delete|action|backup|restore|download-backup\ncron list|get|create|delete|trigger|executions\ntemplates list|get|create|delete|deploy\nnodes list|get|delete|tokens     node agents + onboarding tokens (admin)\nscaling status|policies|services|scale\nha status|alerts|health|policies|enable|disable|failover\nsecurity scan|vulnerabilities|metrics\ngateway services|keys|analytics  (admin)\nadmin overview|users|settings|audit-logs\nnotifications list|read\nup                               deploy the current directory\n```\n\n## containr up\n\nRun inside a git checkout: uses `remote.origin.url` + the current branch\nas the build source, creates a service named after the directory when none\nexists, then triggers a deployment.\n\n```bash\ncontainr up --project <id>\ncontainr up --project <id> --image ghcr.io/example/app:latest   # image, no build\n```\n\nSet `project_id` on the active profile to omit `--project` (stored in\n`~/.containr.yaml` under `profiles.<name>.project_id`).\n\n## Service volumes\n\n`services update` manages mounts; flags replace the whole mount list:\n\n```bash\ncontainr services update <id> --volume data:/data --bind /srv/cfg:/etc/app:ro\ncontainr services update <id> --clear-volumes\n```\n\n`type` is `volume` (docker named volume, auto-created) or `bind` (host\npath). `target` must be absolute. Mounts apply on the next deploy or\nredeploy — `containr deploy <id>` to apply immediately.\n\n`volumes list` shows the node's docker volume inventory with in-use\nflags; `volumes delete <name>` removes an unused volume (admin scope).\n\n## MCP server\n\n`containr-mcp` (`go build ./cmd/mcp`) exposes the same API as MCP tools\nover stdio — every command group above maps to a `containr_*` tool\n(~60 tools). Destructive tools require the caller to pass\n`confirm: true`; results are pretty JSON with `isError` on failures.\n\nClient configuration (Claude Code, Cursor, Devin, any stdio MCP host):\n\n```json\n{\n  \"mcpServers\": {\n    \"containr\": {\n      \"command\": \"containr-mcp\",\n      \"env\": {\n        \"CONTAINR_API_URL\": \"https://containr.example.com\",\n        \"CONTAINR_TOKEN\": \"cnp_...\"\n      }\n    }\n  }\n}\n```\n\nScope the token deliberately: `read` is enough for inspection agents,\n`write` for deploy automation, `admin` only for platform operations.\n\nDeployments are serialized per service: a second `deploy` on a busy\nservice lands in `queued` state and runs when the active one finishes.\n`deployments cancel <id>` drops a queued deployment or aborts a running\none (builds/reconciles stop via context cancellation).\n"
+    "markdown": "# Containr CLI\n\nThe CLI controls every part of a Containr instance — the same API surface\nthe web UI uses. Build it with `scripts/build-cli.sh` or\n`go build ./cmd/cli` from `app/backend`.\n\n## Authentication\n\nCreate a personal access token in the web UI under\n**Settings → Personal Access Tokens** (or `containr tokens create`), then:\n\n```bash\ncontainr auth login cnp_...                      # verify + store\ncontainr auth login cnp_... --url https://containr.example.com\ncontainr auth login cnp_... --name production    # named profile\ncontainr auth status                             # show active profile + identity\ncontainr auth logout\n```\n\nResolution order for every command: `--token`/`--api-url` flags >\n`CONTAINR_TOKEN`/`CONTAINR_API_URL` env > active profile >\n`http://localhost:8080/api/v1`. The active profile is `--profile` >\n`CONTAINR_PROFILE` > `current_profile` in `~/.containr.yaml`.\n\n## Output and scripting\n\n- `--json` prints the raw API response — safe to pipe and parse.\n- `--yes` / `-y` skips confirmation on destructive commands (delete,\n  revoke, restore, failover). Non-interactive shells refuse destructive\n  commands without it.\n- Exit codes are stable: `0` ok, `1` error, `2` auth/permission,\n  `3` not found, `4` validation, `5` unreachable.\n\n## Commands\n\n```\nauth login|logout|status         token auth and profiles\ntokens list|create|revoke        personal access tokens\nprojects list|get|create|delete\nservices list|get|create|update|delete|start|stop|restart|redeploy\nservices domains list|add|remove|default|check   multi-domain + DNS preflight\nvolumes list|delete              docker volume inventory + cleanup (admin)\ndeploy <service-id>              trigger a deployment (--no-cache, --commit-hash, --branch)\ndeployments list|get|logs|rollback|cancel\nlogs <service-id> [--follow]     runtime logs (SSE follow)\nexec <service-id> -- <cmd>       one-off container command\nvariables list|set|unset         env vars (secrets masked; --redeploy applies them)\ndatabases list|get|create|delete|action|backup|restore|download-backup\ncron list|get|create|delete|trigger|executions\ntemplates list|get|create|delete|deploy\nnodes list|get|delete|tokens     node agents + onboarding tokens (admin)\nscaling status|policies|services|scale\nha status|alerts|health|policies|enable|disable|failover\nsecurity scan|vulnerabilities|metrics\ngateway services|keys|analytics  (admin)\nadmin overview|users|settings|audit-logs\nnotifications list|read\nup                               deploy the current directory\n```\n\n## containr up\n\nRun inside a git checkout: uses `remote.origin.url` + the current branch\nas the build source, creates a service named after the directory when none\nexists, then triggers a deployment.\n\n```bash\ncontainr up --project <id>\ncontainr up --project <id> --image ghcr.io/example/app:latest   # image, no build\n```\n\nSet `project_id` on the active profile to omit `--project` (stored in\n`~/.containr.yaml` under `profiles.<name>.project_id`).\n\n## Service volumes\n\n`services update` manages mounts; flags replace the whole mount list:\n\n```bash\ncontainr services update <id> --volume data:/data --bind /srv/cfg:/etc/app:ro\ncontainr services update <id> --clear-volumes\n```\n\n`type` is `volume` (docker named volume, auto-created) or `bind` (host\npath). `target` must be absolute. Mounts apply on the next deploy or\nredeploy — `containr deploy <id>` to apply immediately.\n\n`volumes list` shows the node's docker volume inventory with in-use\nflags; `volumes delete <name>` removes an unused volume (admin scope).\n\n## Service domains and access\n\nA service can carry multiple hostnames; the default is mirrored to\n`services.domain`:\n\n```bash\ncontainr services domains add <id> app.example.com --default\ncontainr services domains check <id>      # DNS preflight per domain\ncontainr services domains remove <id> <domain-id>\n```\n\nDNS check compares each domain to the expected target — set\n`app_settings.public_ip` (or `PUBLIC_IP` env) so `wrong-target` is\nmeaningful; without it any resolvable domain reports `ok`.\n\nAccess gates apply via Traefik middlewares (no extra proxy):\n\n```bash\ncontainr services update <id> --maintenance on\ncontainr services update <id> --basic-auth admin:secret --basic-auth ops:pw2\n```\n\nMaintenance mode redirects all traffic to `<BASE_URL>/api/v1/maintenance`\n— set `app_settings.base_url` or `BASE_URL`; without it the service is\ntaken offline with empty responses. Basic-auth credentials are stored\nbcrypt-hashed (htpasswd) and gate every request.\n\n## MCP server\n\n`containr-mcp` (`go build ./cmd/mcp`) exposes the same API as MCP tools\nover stdio — every command group above maps to a `containr_*` tool\n(~60 tools). Destructive tools require the caller to pass\n`confirm: true`; results are pretty JSON with `isError` on failures.\n\nClient configuration (Claude Code, Cursor, Devin, any stdiLine truncated
   },
   {
     "path": "guides/CLOUDFLARE_SETUP.md",