refactor(apps): split monolithic apps Kustomization into dependency waves

Replaces the single `apps` Flux Kustomization with dependency-ordered waves
(apps-wave-0..2) so a crashlooping workload isolates to its wave + downstream
instead of stalling the entire app tier. Parallel within a wave, ordered across.

- catalog/render.py: compute waves by longest dependency-path depth over the
  ServiceDefinition `dependencies:` edges (a `<svc>-db` is a leaf, so its
  consumer lands strictly higher — the "DB below consumer" rule falls out of
  longest-path, no special case). `--emit-waves` generates the per-wave
  kustomizations + Flux CRs; `--wave-layout` places renders into the right dir.
  wave 0: pihole gitea jackett plex qbittorrent nextcloud-db semaphore-db
  wave 1: sonarr radarr nextcloud semaphore gitea-actions
  wave 2: seerr
- apps/*.yaml -> apps/wave-{0,1,2}/ (byte-identical moves; SOPS files intact).
- clusters/base: apps.yaml removed; apps-wave-{0,1,2}.yaml added (dependsOn
  chain: platform-config -> wave-0 -> wave-1 -> wave-2, prune+wait each).
- clusters/dev: one SOPS decryption patch per wave (load-bearing).
- DESIGN-waves.md: wave table, topology, cutover runbook.

Cutover: preceded by disabling prune on `apps` (1bfb0db) so removing that
object here does not GC its resources; the wave Kustomizations SSA-adopt the
byte-identical manifests in place (no restart, no PVC churn).

Co-Authored-By: Claude Opus 4.8 <[email protected]>

apps/wave-0/gitea-bootstrap-secret.sops.yaml

@@ -0,0 +1,36 @@
+# Gitea headless-install bootstrap secret (WS-APPS, Phase 6). SOPS-encrypted (age).
+# secret-key: FIXED, persistent Gitea SECRET_KEY (must not regenerate per restart).
+# admin-*: break-glass local admin (docs/15 availability caveat). Recover with:
+#   infra/devcontainer/dev.sh run sops -d apps/gitea-bootstrap-secret.sops.yaml
+apiVersion: v1
+kind: Secret
+metadata:
+    name: gitea-bootstrap
+    namespace: gitea
+    labels:
+        app.kubernetes.io/name: gitea
+type: Opaque
+stringData:
+    secret-key: ENC[AES256_GCM,data:N4wgSipwTYNgkwujPzGs8Bo63IzUip1TwfVq9fG+Z2nECrgIV9PYkEyL4ic3Ej9f5udOE4fHwsbgcyuiJw==,iv:p33bef3z2fDbaAi6beGF+CWmeTeS7Vn46ce1/2zQH4g=,tag:CLJ+kZbmz0tiPtOsI3+dIg==,type:str]
+    admin-username: ENC[AES256_GCM,data:hyWYQ3UC8c9H2Os=,iv:bgn72bsILLxChY9QAsAD3tYWvsWS2CBe0FlneCCSr+E=,tag:7qP/P8TjDmRFsuXjJF8A2g==,type:str]
+    admin-password: ENC[AES256_GCM,data:GPz1vracB1U6YurrV1AEhX9VEGx3lwCOXqOmKAg6+/6NjGPmTv+r2uosawVYtwie,iv:L/QKFqo7RpSg4eQGie/+R5BDBgTiTzwDdWuofJeebFE=,tag:cD6AU9tahLskTaaU/A7BOA==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age:
+        - recipient: age175l8mdpdfu7hq0aml3exs3gykarwjmuvr23sq56s3wjejnyk44wsp4mfzg
+          enc: |
+            -----BEGIN AGE ENCRYPTED FILE-----
+            YWdlLWVuY3J5cHRpb24ub3JnL3YxCi0+IFgyNTUxOSA1bXVWK2sxUDNyZ0UvcFhW
+            MDZ2akY3ditycjdQN0FSM2JYcXZod2lqS0F3ClF6T2pOdmxNZ3JwSjdLeDBBYmR4
+            QU52bWlDdGVBZkM2ZW1BNkRFSjVpcTQKLS0tIHdYS1VQaE5mSUhXR1U4UktyM1Jm
+            Nys4V2NBZWF6U2lER05HV3FNZ1pOQ1kKEVHBTPTAJfiQBzkP/QezTzOfS96nYzxg
+            Ad1m50j67vyFaBCVAb0/0toEUAm+qEV4wzOglaNmZuScavY4ntwCIw==
+            -----END AGE ENCRYPTED FILE-----
+    lastmodified: "2026-08-25T23:06:33Z"
+    mac: ENC[AES256_GCM,data:ik735BfSMdlB4IUceScEfY4aNNNo61po7W7x/6iod1VvsiMo0+7nUrVqD2uiL8p066k6g/hV+BNg5BwnYRVjvkVm8tU60ctcjEDfinxtgnqRNBVK81RROn5GtsRCzuBxiJ5J8ulgb45+jG9ND6Xuo9XuTZ35PWs/4/Ebdl/jpPM=,iv:Nt3QtDz3S37AnrtG2nd1TIHgFFemgxXrKrHfXTVo6S4=,tag:ScMtwQAF8a4heyhN+iXt/A==,type:str]
+    pgp: []
+    encrypted_regex: ^(data|stringData)$
+    version: 3.9.4