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/i18n/locales/en.json

@@ -392,10 +392,7 @@
         "thinkingOptimizer": "Thinking Optimization",
         "thinkingOptimizerDescription": "Automatically enable Adaptive Thinking for Opus/Sonnet, and inject Extended Thinking for legacy models",
         "cacheInjection": "Cache Injection",
-        "cacheInjectionDescription": "Automatically inject cache breakpoints at key positions in requests to reduce duplicate token billing",
-        "cacheTtl": "Cache TTL",
-        "cacheTtl5m": "5 minutes",
-        "cacheTtl1h": "1 hour"
+        "cacheInjectionDescription": "Automatically inject standard 5-minute cache breakpoints at key positions to reduce duplicate token billing"
       },
       "logConfig": {
         "title": "Log Management",

src/i18n/locales/ja.json

@@ -392,10 +392,7 @@
         "thinkingOptimizer": "Thinking 最適化",
         "thinkingOptimizerDescription": "Opus/Sonnet に Adaptive Thinking を自動的に有効化し、レガシーモデルに Extended Thinking を注入",
         "cacheInjection": "Cache 注入",
-        "cacheInjectionDescription": "リクエストの重要な位置に Cache ブレークポイントを自動注入し、重複トークンの課金を削減",
-        "cacheTtl": "Cache TTL",
-        "cacheTtl5m": "5 分",
-        "cacheTtl1h": "1 時間"
+        "cacheInjectionDescription": "リクエストの重要な位置に標準の 5 分間 Cache ブレークポイントを自動注入し、重複トークンの課金を削減"
       },
       "logConfig": {
         "title": "ログ管理",

src/i18n/locales/zh-TW.json

@@ -392,10 +392,7 @@
         "thinkingOptimizer": "Thinking 最佳化",
         "thinkingOptimizerDescription": "自動為 Opus/Sonnet 啟用 Adaptive Thinking，為舊模型注入 Extended Thinking",
         "cacheInjection": "Cache 注入",
-        "cacheInjectionDescription": "自動在請求關鍵位置注入 Cache 斷點，減少重複 token 計費",
-        "cacheTtl": "Cache TTL",
-        "cacheTtl5m": "5 分鐘",
-        "cacheTtl1h": "1 小時"
+        "cacheInjectionDescription": "自動在請求關鍵位置注入標準 5 分鐘 Cache 斷點，減少重複 token 計費"
       },
       "logConfig": {
         "title": "日誌管理",

src/i18n/locales/zh.json

@@ -392,10 +392,7 @@
         "thinkingOptimizer": "Thinking 优化",
         "thinkingOptimizerDescription": "自动为 Opus/Sonnet 启用 Adaptive Thinking，为旧模型注入 Extended Thinking",
         "cacheInjection": "Cache 注入",
-        "cacheInjectionDescription": "自动在请求关键位置注入 Cache 断点，减少重复 token 计费",
-        "cacheTtl": "Cache TTL",
-        "cacheTtl5m": "5 分钟",
-        "cacheTtl1h": "1 小时"
+        "cacheInjectionDescription": "自动在请求关键位置注入标准 5 分钟 Cache 断点，减少重复 token 计费"
       },
       "logConfig": {
         "title": "日志管理",