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/sqlc/schema.sql

@@ -52,7 +52,13 @@ CREATE TABLE services (
     git_branch VARCHAR(100),
     build_path VARCHAR(500),
     cpu VARCHAR(50),
-    memory VARCHAR(50)
+    memory VARCHAR(50),
+    replicas INTEGER NOT NULL DEFAULT 1,
+    port INTEGER NOT NULL DEFAULT 0,
+    domain VARCHAR(255) NOT NULL DEFAULT '',
+    healthcheck_path VARCHAR(255) NOT NULL DEFAULT '',
+    restart_policy VARCHAR(50) NOT NULL DEFAULT 'unless-stopped',
+    published_port INTEGER NOT NULL DEFAULT 0
 );
 
 CREATE TABLE deployments (