chore(release): publish backend 0.6.4, web 0.5.3, chart 0.3.4

Ships the upstream sync. TestUpMigrationsAreAdditive passes, so
migrations 437-440 are additive and this release rolls without the
old-pod/new-schema exposure the last one carried.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0139HifgAnzidSr2ELgAS7XK

Author: wujunyi792

deploy/helm/multica/values.yaml

@@ -2,8 +2,8 @@
 # The workflow rewrites these two lines, so the published chart pins the exact
 # images it just built. Individual image tags below still override them.
 release:
-  backendVersion: "0.6.3"
-  webVersion: "0.5.2"
+  backendVersion: "0.6.4"
+  webVersion: "0.5.3"
 
 # References to registry credentials already created in the target namespace.
 # The production cluster supplies its Aliyun ACR pull secret here.

release.yml

@@ -12,6 +12,6 @@
 #   ALIYUN_REGISTRY_USERNAME
 #   ALIYUN_REGISTRY_PASSWORD
 
-backend: 0.6.3
-web: 0.5.2
-chart: 0.3.3
+backend: 0.6.4
+web: 0.5.3
+chart: 0.3.4