Compute memory/ephemeral-storage limits from requests, drop default CPU limits

Every chart now renders its container resources through a duplicated
_helpers.tpl helper (reference implementation in template-chart): requests
ship as chart defaults, missing memory and ephemeral-storage limits are
computed as resources.limitFactor x the request (default 3, satisfactory
keeps 2 to preserve its previously published 8Gi limit), an explicitly set
limit always wins, and a CPU limit is only rendered when set explicitly.
Fixed limit defaults are removed from all values.yaml files; teamspeak-server
gains a values-driven resources block instead of hardcoded template values.
Major version bump for all published charts.

voucher-vault/values.yaml

@@ -5,14 +5,14 @@ secrets:
 
 voucherVault:
   resources:
+    # Limits are optional: memory and ephemeral-storage limits default to
+    # limitFactor x the request, an explicitly set limit always wins, and a
+    # CPU limit is only set when configured explicitly under "limits".
+    limitFactor: 3
     requests:
       cpu: 0.1
       memory: 256Mi
       ephemeral-storage: 10Mi
-    limits:
-      cpu: 1
-      memory: 384Mi
-      ephemeral-storage: 100Mi
   # "/" answers with a redirect for anonymous users, which httpGet treats as
   # success. The Host header must be set to 127.0.0.1 because Django's
   # ALLOWED_HOSTS only accepts 127.0.0.1 and the configured DOMAIN — probing