revert(proxy): drop the 1-hour cache TTL option and TTL-bucketed write accounting

The forced 1-hour cache_control TTL (schema v14) was a mistake. Injected
breakpoints return to Anthropic's standard 5-minute TTL, caller-owned
markers are preserved verbatim instead of having their TTLs rewritten,
and the 5m/1h cache-write buckets are removed from usage parsing and
pricing (back to the single aggregate cache-creation rate). The cache
TTL selector is removed from the rectifier settings panel along with its
i18n keys in all four locales.

SCHEMA_VERSION returns to 13: the unreleased cache_creation_1h_tokens
column and the v13->v14 migration are removed. The feature never shipped
in a release and the introducing commit was never pushed, so no
databases were stamped v14 outside this machine (local DB verified at
user_version 13).

src/components/settings/RectifierConfigPanel.tsx

@@ -22,7 +22,6 @@ export function RectifierConfigPanel() {
     enabled: false,
     thinkingOptimizer: true,
     cacheInjection: true,
-    cacheTtl: "1h",
   });
   const [isLoading, setIsLoading] = useState(true);
 
@@ -204,31 +203,6 @@ export function RectifierConfigPanel() {
                 }
               />
             </div>
-
-            {optimizerConfig.cacheInjection && (
-              <div className="flex items-center justify-between">
-                <div className="space-y-0.5">
-                  <Label>{t("settings.advanced.optimizer.cacheTtl")}</Label>
-                </div>
-                <select
-                  className="h-9 rounded-md border border-input bg-background px-3 text-sm"
-                  value={optimizerConfig.cacheTtl}
-                  disabled={
-                    !optimizerConfig.enabled || !optimizerConfig.cacheInjection
-                  }
-                  onChange={(e) =>
-                    handleOptimizerChange({ cacheTtl: e.target.value })
-                  }
-                >
-                  <option value="5m">
-                    {t("settings.advanced.optimizer.cacheTtl5m")}
-                  </option>
-                  <option value="1h">
-                    {t("settings.advanced.optimizer.cacheTtl1h")}
-                  </option>
-                </select>
-              </div>
-            )}
           </div>
         </div>
       </div>