优化: token分项显示(in/cache/out/reasoning)+ 详情面板 + base前置

token分项(各计费不同,不显 total):df-ai 解析 provider cache/reasoning(openai_compat prompt_cache_hit/miss/reasoning_tokens + anthropic cache_read/creation)+ TokenUsage 加字段(全构造点)+ AiMessage/AiCompleted/DB V39(ai_messages 加 cache_hit/miss/reasoning 列)+ message_repo 映射(持久化)+ 前端 MessageList 显 in·cache·out·reason(in=cache_miss 全价,reasoning 有才显)+ 点击 token 弹详情面板(完整 usage+缓存命中率+model)+ df-miniapp 同步

base前置(提升 prompt cache 命中率):chat.rs aug 拼 base 后(4处)+ knowledge_inject 知识拼 base 后(固定 base 前缀,cache 命中)

附修:replace_conversation 原 13 列 INSERT 丢消息级 token → 改 18 列

apps/df-miniapp/src/composables/useAiChat.ts

@@ -601,6 +601,9 @@ export function handleEvent(event: AiChatEvent): void {
         prompt: event.prompt_tokens,
         completion: event.completion_tokens,
         total: event.total_tokens,
+        cache_hit: event.prompt_cache_hit_tokens,
+        cache_miss: event.prompt_cache_miss_tokens,
+        reasoning: event.reasoning_tokens,
       }
       // 不完整标记(网络中断保文)
       if (event.incomplete) {