fix: HA checks resolve service targets over project network; persist checks (#13)

- Health checks for local services dialed 127.0.0.1 from inside the backend
  container — the host's published port is unreachable there. Service-bound
  checks now resolve the service's DNS name on its project network (backend
  joins on demand), falling back to the service's stored port. A resolver
  failure surfaces as TARGET_UNRESOLVED instead of a fake loopback probe.
- Checks lived only in memory: a backend restart silently deleted every
  configured health check. ha_health_checks table + write-through on
  add/update/tick and hydrate-on-boot, matching the scaling-policy pattern.
- sqlc schema.sql gained the runtime columns added by later migrations —
  the stale snapshot already caused one silently-dropped-column bug.
- OpenAPI: runtime response now documents ports and health fields; types
  regenerated.
- Buttons no longer wrap ("+ new project" rendered on two lines).

Verified live: service check probes whoami-web:80 via DNS → healthy;
check survives a backend restart and rehydrates.

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

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

app/backend/migrations_goose/20261004120000_ha_health_checks.sql

@@ -0,0 +1,18 @@
+-- +goose Up
+-- Persisted HA health checks. Previously checks lived only in memory, so a
+-- backend restart silently deleted every configured check while services kept
+-- running unmonitored.
+CREATE TABLE IF NOT EXISTS ha_health_checks (
+    id          uuid PRIMARY KEY,
+    service_id  uuid NOT NULL REFERENCES services(id) ON DELETE CASCADE,
+    node_id     varchar(255) NOT NULL DEFAULT '',
+    type        varchar(20) NOT NULL,
+    config      jsonb NOT NULL DEFAULT '{}'::jsonb,
+    status      varchar(20) NOT NULL DEFAULT 'unknown',
+    last_check  timestamptz,
+    created_at  timestamptz NOT NULL DEFAULT now(),
+    updated_at  timestamptz NOT NULL DEFAULT now()
+);
+
+-- +goose Down
+DROP TABLE IF EXISTS ha_health_checks;