Initial commit: cert-manager API server

FastAPI-based SSL certificate automation server.
- Google Public CA wildcard cert issuance via certbot
- Cloudflare DNS-01 challenge with auto EAB key generation
- APISIX multi-instance deployment with domain-instance mapping
- Vault integration for all secrets
- Bearer token auth, retry logic, Discord DM alerts
- Auto-renewal scheduler (daily 03:00 UTC)

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

config.json

@@ -0,0 +1,20 @@
+{
+  "google_acme_server": "https://dv.acme-v02.api.pki.goog/directory",
+  "certbot_email": "kappa@inouter.com",
+  "gcp_project": "cert-manager-495109",
+  "dns_propagation_seconds": 30,
+  "apisix_instances": [
+    {
+      "name": "kr1",
+      "admin_url": "http://100.84.111.28:9180"
+    },
+    {
+      "name": "osaka",
+      "admin_url": "http://100.108.39.107:9180"
+    }
+  ],
+  "domain_instance_map": {
+    "*.jp.inouter.com": ["osaka"],
+    "*.kr.inouter.com": ["kr1"]
+  }
+}