refactor: bootstrap/infra/ci separation (#27)

- Create bootstrap/ dir: cert-manager, traefik-routes, argo-rollouts,
  kargo, kargo-*-pipeline (not managed by Kargo promotion)
- infra/ now only: gitea, gitea-custom (promoted by Kargo)
- ci/ unchanged: gitea-runner (promoted by Kargo)
- Split kargo/credentials/ into dev/ and prod/ with separate ksops generators
- Remove kargo-credentials from AppSet (managed by Pulumi Go code)
- Update infra Warehouse: only gitea (was also argo-rollouts, cert-manager)
- Update infra Stage dev: only yaml-update for gitea version
- Fix test-env warehouse: valid subscription instead of empty array
- Update step numbers: bootstrap 1-5, infra 1-2

kargo/credentials/dev/git-creds-infra.dev.enc.yaml

@@ -0,0 +1,36 @@
+apiVersion: v1
+kind: Secret
+metadata:
+    name: github-creds
+    namespace: infra
+    labels:
+        kargo.akuity.io/cred-type: git
+type: Opaque
+stringData:
+    repoURL: https://github.com/Kargones/deploy-app-kargo-private.git
+    username: Kargones
+    password: ENC[AES256_GCM,data:lzaZLTkmA68DadpquacJNc6CMxwv3wOlWh6Ze8e23F9lzFKw3oB5gg==,iv:9EZUg6DSUFnNddOaiB2oIfNYhaOKKkrP9Hkf+5OGcLk=,tag:rr6ej2x87mquQbXiBM7+Ow==,type:str]
+sops:
+    age:
+        - recipient: age1xmnaqlrjzpk5hl7uhel9sehqh7zdz8p59qte2myt97aqd7lyeuxszuess7
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBCeGdkaVJiNWE0Q0xWbTVT
+            dkZDN296VXJUMktMVUZ2U3FyeUwvVzBSaWc0CmRlWFpLdTlCNXl3eEtKcDRrUzhV
+            SG9KdkhlSTg0SnZwK3BvS0hkT3FjbjgKLS0tIDA2Y1lic053ejR0UWZUekZ1Y1JK
+            c2llUmhKNTRjaW1zQ3AyZzUvR1VRUG8KuFXq5pbpEEZd3P/E5bD0FCuSOIuGCsJL
+            bUx6VucI1zZF0DbXjzr28FsxqSJW4GiCpDscj1LGQIZa5jvj8aWMXA==
+            -----END AGE ENCRYPTED FILE-----
+        - recipient: age1ame2tp44sq9rmkqzqvxy77eu7qd2035kmlgcsfjfxj2jughv3clqlku03g
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSBRRlh5SXdkTmZOVUdXc21N
+            aXNZaDhydXA3dUU4OHlidmViM2xUQU5rNDF3Ck9iditWSWcyaWoxNTVTRzN5Y0ZU
+            c21BT2R6U2lxNkh6cU9kdjFSRUVjUWsKLS0tIHBwWGI1R2p0TTg1amFRM2FlYVQx
+            Q2lIZDJ0ZkliWEtiVGd5eXIxMjB1OGMKeK2iTyPBrcIWByU9QXZ3Ora7gylwC66g
+            diGbcUF5ER7mUt0KEILTwuMkTUbhy1F5zLYB7p4e49YdY2O8mz51SA==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-03-11T06:58:02Z"
+    mac: ENC[AES256_GCM,data:dzyW+dAsjPDrZQ3EWNnhLWfd9DSmRVSp1Qrm+nx4qFfsRoS5y61jnkhVyupq2OUVsuUTuePIAqmZQI16HD0TTMJIN9UKPdW2sEj/DGwdBXqcJRs6mvJlv79Jh2VlzJdJSpZf/YhCBVIVThZqrWBI1T1jPdN1gaJ0ov6cSAqYjPU=,iv:MMhdUthu2nUFJOkxXz00xXMiH7tit7sNejU/aXuQOmY=,tag:+NSHR9T4wlpJaBH5ZdxhvA==,type:str]
+    encrypted_regex: ^(password|token|secret|key|privateKey|admin-password|db-password|passwordHash|tokenSigningKey)$
+    version: 3.12.1