chart 0.7.4 — install KEDA core + HTTP add-on for AI Studio scale-to-zero

Adds two subchart deps:
  - keda v2.15.1 (event-driven autoscaler, ScaledObject CRD)
  - keda-add-ons-http v0.8.0 (HTTPScaledObject CRD + interceptor-proxy)

Both gated by enabled flags (keda.enabled, kedaHttpAddon.enabled),
default true so all clusters can host AI Studio (per-instance OpenCode
pods that scale 0↔1 on URL hit). Idle cost ~300 MB RAM total — small
relative to typical customer cluster (7+ GB allocatable).

Charts mirrored to registry.odoosky.cloud/odoosky/docker-mirror/charts
following the existing mirror-first pattern used by cert-manager,
traefik, longhorn, external-secrets.

Studio chart (studio-template-v3) created in monorepo as part of the
same feature; chart-side IngressRoute will be updated in 0.1.1 to
point at keda-add-ons-http-interceptor-proxy.keda.svc instead of the
per-instance Service (KEDA HTTP routing pattern). Tower handlers for
deploy/get/write-mode-toggle/delete already shipped in 0.76.47 behind
a studioChartReady=false feature flag.

values.yaml

@@ -305,3 +305,82 @@ externalSecrets:
 # correctly per-cluster.
 external-secrets:
   installCRDs: true
+
+# keda — event-driven autoscaler. Gate for the conditional in
+# Chart.yaml dependencies. Enabled by default so all clusters can
+# host AI Studio (per-instance OpenCode pods that scale 0↔1 via the
+# HTTP add-on below). KEDA's control plane is ~50 MB RAM idle —
+# negligible for clusters that never spawn a Studio.
+#
+# Subchart values pass through under the dep name (`keda:`) below.
+keda:
+  enabled: true
+  # operator + adapter + webhook — keep CPU/RAM modest. KEDA polls
+  # event sources every pollingInterval (default 30s); on a cluster
+  # with no ScaledObjects it does no work.
+  operator:
+    resources:
+      requests:
+        cpu: 50m
+        memory: 100Mi
+      limits:
+        cpu: 500m
+        memory: 256Mi
+  metricsServer:
+    resources:
+      requests:
+        cpu: 50m
+        memory: 100Mi
+      limits:
+        cpu: 500m
+        memory: 256Mi
+  webhooks:
+    resources:
+      requests:
+        cpu: 50m
+        memory: 50Mi
+      limits:
+        cpu: 200m
+        memory: 128Mi
+
+# kedaHttpAddon — gate for the HTTP add-on subchart. Same
+# enabled-by-default rationale: idle interceptor is small, and only
+# clusters with active Studios route traffic through it.
+#
+# The add-on installs the HTTPScaledObject CRD + an interceptor Service
+# in the `keda` namespace at `keda-add-ons-http-interceptor-proxy`.
+# Studio-template-v3's IngressRoute targets that interceptor by name
+# (it figures out which Studio Deployment to wake by Host header
+# matched against HTTPScaledObject.spec.hosts).
+kedaHttpAddon:
+  enabled: true
+
+# keda-add-ons-http — values passed THROUGH to the HTTP add-on
+# subchart. The interceptor is the request-handling hot path; it
+# buffers each cold-start request until the target pod is Ready.
+# The scaler is the control loop watching HTTPScaledObject status.
+keda-add-ons-http:
+  interceptor:
+    replicas:
+      # Scale the interceptor itself with HPA on its own metrics —
+      # not zero (it must always be reachable to wake other pods).
+      # 1 replica is fine for OdooSky's per-customer-cluster load
+      # (single-digit Studios per cluster); upstream's own HPA
+      # handles bursts above that.
+      min: 1
+      max: 3
+    resources:
+      requests:
+        cpu: 50m
+        memory: 100Mi
+      limits:
+        cpu: 500m
+        memory: 256Mi
+  scaler:
+    resources:
+      requests:
+        cpu: 50m
+        memory: 64Mi
+      limits:
+        cpu: 200m
+        memory: 128Mi