feat(m28+m29+m30): ACME ARI, email digest, and Helm chart

M28: ACME Renewal Information (RFC 9702) — CA-directed renewal timing
with cert ID computation, directory endpoint discovery, graceful
degradation for non-ARI CAs. 19 tests.

M29: Email notifier wiring + scheduled certificate digest — SMTP
connector bridged to service layer via NotifierAdapter, DigestService
with HTML email template, 7th scheduler loop (24h), digest preview/send
API endpoints and GUI card. 21 tests.

M30: Production-ready Helm chart — server Deployment, PostgreSQL
StatefulSet, agent DaemonSet, ConfigMaps, Secrets, Ingress, security
contexts, health probes, example values for dev/prod/ACME scenarios.

Also: OpenAPI spec updates, MCP tool additions, CI helm-lint job,
documentation updates across 5 doc files and README.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

deploy/helm/certctl/Chart.yaml

@@ -0,0 +1,20 @@
+apiVersion: v2
+name: certctl
+description: Self-hosted certificate lifecycle management platform
+type: application
+version: 0.1.0
+appVersion: "2.1.0"
+keywords:
+  - certificate
+  - tls
+  - ssl
+  - pki
+  - acme
+  - lifecycle
+  - kubernetes
+maintainers:
+  - name: certctl
+home: https://github.com/shankar0123/certctl
+sources:
+  - https://github.com/shankar0123/certctl
+license: BSL-1.1