feat: add Bedrock request optimizer (PRE-SEND thinking + cache injection) (#1301)

* feat: add Bedrock request optimizer (PRE-SEND thinking + cache injection)

Add a PRE-SEND request optimizer that enhances Bedrock API requests
before forwarding, complementing the existing POST-ERROR rectifier system.

New modules:
- thinking_optimizer: 3-path model detection (adaptive/legacy/skip)
  - Opus 4.6/Sonnet 4.6: adaptive thinking + effort max + 1M context beta
  - Legacy models: inject extended thinking with max budget
  - Haiku: skip (no modification)
- cache_injector: auto-inject cache_control breakpoints (max 4)
  - Injects at tools/system/assistant message positions
  - TTL upgrade for existing breakpoints (5m → 1h)

Gate: only activates for Bedrock providers (CLAUDE_CODE_USE_BEDROCK=1)
Config: stored in SQLite settings table, default OFF, user opt-in
UI: new Optimizer section in RectifierConfigPanel with 3 toggles + TTL

18 unit tests covering all paths. Verified against live Bedrock API.

* chore: remove docs/plans directory

* fix: address code review findings for Bedrock request optimizer

P0 fixes:
- Replace hardcoded Chinese with i18n t() calls in optimizer panel,
  add translation keys to zh/en/ja locale files
- Fix u64 underflow: max_tokens - 1 → max_tokens.saturating_sub(1)
- Move optimizer from before retry loop to per-provider with body
  cloning, preventing Bedrock fields leaking to non-Bedrock providers

P1 fixes:
- Replace .map() side-effect pattern with idiomatic if-let (clippy)
- Fix module alphabetical ordering in mod.rs
- Add cache_ttl whitelist validation in set_optimizer_config
- Remove #[allow(unused_assignments)] and dead budget decrement

---------

Co-authored-by: Keith (via OpenClaw) <keithyt06@users.noreply.github.com>
Co-authored-by: Jason <farion1231@gmail.com>

src/components/settings/RectifierConfigPanel.tsx

@@ -3,7 +3,11 @@ import { useTranslation } from "react-i18next";
 import { toast } from "sonner";
 import { Switch } from "@/components/ui/switch";
 import { Label } from "@/components/ui/label";
-import { settingsApi, type RectifierConfig } from "@/lib/api/settings";
+import {
+  settingsApi,
+  type RectifierConfig,
+  type OptimizerConfig,
+} from "@/lib/api/settings";
 
 export function RectifierConfigPanel() {
   const { t } = useTranslation();
@@ -12,6 +16,12 @@ export function RectifierConfigPanel() {
     requestThinkingSignature: true,
     requestThinkingBudget: true,
   });
+  const [optimizerConfig, setOptimizerConfig] = useState<OptimizerConfig>({
+    enabled: false,
+    thinkingOptimizer: true,
+    cacheInjection: true,
+    cacheTtl: "1h",
+  });
   const [isLoading, setIsLoading] = useState(true);
 
   useEffect(() => {
@@ -20,6 +30,10 @@ export function RectifierConfigPanel() {
       .then(setConfig)
       .catch((e) => console.error("Failed to load rectifier config:", e))
       .finally(() => setIsLoading(false));
+    settingsApi
+      .getOptimizerConfig()
+      .then(setOptimizerConfig)
+      .catch((e) => console.error("Failed to load optimizer config:", e));
   }, []);
 
   const handleChange = async (updates: Partial<RectifierConfig>) => {
@@ -34,6 +48,18 @@ export function RectifierConfigPanel() {
     }
   };
 
+  const handleOptimizerChange = async (updates: Partial<OptimizerConfig>) => {
+    const newConfig = { ...optimizerConfig, ...updates };
+    setOptimizerConfig(newConfig);
+    try {
+      await settingsApi.setOptimizerConfig(newConfig);
+    } catch (e) {
+      console.error("Failed to save optimizer config:", e);
+      toast.error(String(e));
+      setOptimizerConfig(optimizerConfig);
+    }
+  };
+
   if (isLoading) return null;
 
   return (
@@ -86,6 +112,94 @@ export function RectifierConfigPanel() {
           />
         </div>
       </div>
+
+      <div className="border-t pt-6 mt-6">
+        <div className="space-y-1 mb-4">
+          <h3 className="text-sm font-medium">
+            {t("settings.advanced.optimizer.title")}
+          </h3>
+          <p className="text-xs text-muted-foreground">
+            {t("settings.advanced.optimizer.description")}
+          </p>
+        </div>
+
+        <div className="space-y-4">
+          <div className="flex items-center justify-between">
+            <div className="space-y-0.5">
+              <Label>{t("settings.advanced.optimizer.enabled")}</Label>
+            </div>
+            <Switch
+              checked={optimizerConfig.enabled}
+              onCheckedChange={(checked) =>
+                handleOptimizerChange({ enabled: checked })
+              }
+            />
+          </div>
+
+          <div className="space-y-4 pl-4">
+            <div className="flex items-center justify-between">
+              <div className="space-y-0.5">
+                <Label>
+                  {t("settings.advanced.optimizer.thinkingOptimizer")}
+                </Label>
+                <p className="text-xs text-muted-foreground">
+                  {t(
+                    "settings.advanced.optimizer.thinkingOptimizerDescription",
+                  )}
+                </p>
+              </div>
+              <Switch
+                checked={optimizerConfig.thinkingOptimizer}
+                disabled={!optimizerConfig.enabled}
+                onCheckedChange={(checked) =>
+                  handleOptimizerChange({ thinkingOptimizer: checked })
+                }
+              />
+            </div>
+
+            <div className="flex items-center justify-between">
+              <div className="space-y-0.5">
+                <Label>{t("settings.advanced.optimizer.cacheInjection")}</Label>
+                <p className="text-xs text-muted-foreground">
+                  {t("settings.advanced.optimizer.cacheInjectionDescription")}
+                </p>
+              </div>
+              <Switch
+                checked={optimizerConfig.cacheInjection}
+                disabled={!optimizerConfig.enabled}
+                onCheckedChange={(checked) =>
+                  handleOptimizerChange({ cacheInjection: checked })
+                }
+              />
+            </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>
     </div>
   );
 }