feat(agent): Agent 工作台 - 计划插话记忆、统一模型选择器并修复摘要与视频入库

将计划清单、运行中插话和个人记忆接入云端 Agent；全站模型选择器统一为左右二级菜单。画布摘要按预算截断不再整轮拒绝，首页视频未知宽高可入库。README 补充贡献者 morrow。

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/internal/app/analytics.go

@@ -1057,10 +1057,13 @@ func (s *Service) enrichAPICallLogPayload(log *model.ApiCallLog, payload map[str
 			log.UsageAvailable = log.OutputTokens > 0
 		}
 		if details, ok := usage["input_tokens_details"].(map[string]any); ok {
-			log.CachedTokens = firstInt64(details, "cached_tokens")
+			log.CachedTokens = firstInt64(details, "cached_tokens", "cache_read_input_tokens")
 		}
 		if details, ok := usage["prompt_tokens_details"].(map[string]any); ok && log.CachedTokens == 0 {
-			log.CachedTokens = firstInt64(details, "cached_tokens")
+			log.CachedTokens = firstInt64(details, "cached_tokens", "cache_read_input_tokens")
+		}
+		if log.CachedTokens == 0 {
+			log.CachedTokens = firstInt64(usage, "cached_tokens", "cache_read_input_tokens", "prompt_cache_hit_tokens")
 		}
 	}
 	if usageMetadata, ok := payload["usageMetadata"].(map[string]any); ok {