fix(shared-ols): never cache logged-in pages (disable tier private cache)

OLS tier had enablePrivateCache=1 + checkPrivateCache=1 at module scope on the
assumption that with no LiteSpeed Cache WP plugin nothing would be cached. In
practice OLS privately cached logged-in / cookie-bearing responses regardless of
the plugin, serving stale wp-admin pages for the full privateExpireInSeconds TTL
(observed: a WordPress 'automated update failed' nag persisting after the cause
was cleared).

Disable private caching at the tier (enablePrivateCache 0 + checkPrivateCache 0)
so logged-in pages are always served fresh. Public/anonymous caching is unchanged
(enableCache 1 + checkPublicCache 1), still honored from the plugin's
X-LiteSpeed-Cache-Control headers.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

configs/shared-ols/httpd_config_base.tpl

@@ -23,13 +23,20 @@ useIpInProxyHeader        1
 
 ## LSCache enabled at MODULE scope for the whole tier (dedicated cache volume,
 ## ephemeral across rebuilds; OLS auto-keys a per-vhost subdir under storagePath).
-## enableCache/enablePrivateCache ON here means the cache module is ACTIVE, but a
-## response is only cached if it's marked cacheable — the LiteSpeed Cache WP
-## plugin sets X-LiteSpeed-Cache-Control headers, and checkPublic/PrivateCache +
-## ignoreRespCacheCtrl=0 make OLS honor them. No plugin → nothing cached (safe).
+## PUBLIC (anonymous) caching ONLY: enableCache 1 + checkPublicCache 1 let OLS
+## serve cacheable, non-logged-in responses marked by the LiteSpeed Cache WP
+## plugin's X-LiteSpeed-Cache-Control headers (ignoreRespCacheCtrl=0 honors them).
+##
+## PRIVATE caching is intentionally OFF (enablePrivateCache 0 + checkPrivateCache 0).
+## Logged-in / cookie-bearing pages must NEVER be cached at the tier. We previously
+## left enablePrivateCache=1 assuming "no plugin -> nothing cached," but that was
+## WRONG: with private storage + reqCookieCache on, OLS privately cached logged-in
+## responses regardless of plugin, serving stale wp-admin (e.g. a "failed update"
+## nag that persisted for the full privateExpireInSeconds TTL). Keeping private
+## cache off guarantees logged-in pages are always served fresh.
 module cache {
   storagePath             ${LSCACHE_ROOT}
-  checkPrivateCache       1
+  checkPrivateCache       0
   checkPublicCache        1
   maxCacheObjSize         10000000
   maxStaleAge             200
@@ -39,6 +46,6 @@ module cache {
   ignoreReqCacheCtrl      0
   ignoreRespCacheCtrl     0
   enableCache             1
-  enablePrivateCache      1
+  enablePrivateCache      0
 }
 ## ---- end shared-ols server append ----