fix: miscellaneous quick fixes from CodeRabbit review

- log_info_generate.go: add nil guard in InjectTieredBillingInfo
- billing_expr_request.go: merge headers instead of replacing
- go.mod: remove incorrect // indirect on expr-lang/expr
- ToolPriceSettings.jsx: add null check in syncToVisual
- tool_billing.go: fix PricePer1K for image_generation (per-call, not per-1K)
- utils.jsx: add minute() to time condition regex
- useUsageLogsData.jsx: pass displayMode to renderTieredModelPrice
- AGENTS.md, CLAUDE.md: fix Rule 6/7 ordering
- relay-gemini.go: add TEXT modality case in CandidatesTokensDetails

relay/channel/gemini/relay-gemini.go

@@ -1045,6 +1045,8 @@ func buildUsageFromGeminiMetadata(metadata dto.GeminiUsageMetadata, fallbackProm
 			usage.CompletionTokenDetails.ImageTokens += detail.TokenCount
 		case "AUDIO":
 			usage.CompletionTokenDetails.AudioTokens += detail.TokenCount
+		case "TEXT":
+			usage.CompletionTokenDetails.TextTokens += detail.TokenCount
 		}
 	}
 

relay/helper/billing_expr_request.go

@@ -13,9 +13,11 @@ import (
 func ResolveIncomingBillingExprRequestInput(c *gin.Context, info *relaycommon.RelayInfo) (billingexpr.RequestInput, error) {
 	if info != nil && info.BillingRequestInput != nil {
 		input := cloneRequestInput(*info.BillingRequestInput)
-		if len(input.Headers) == 0 {
-			input.Headers = cloneStringMap(info.RequestHeaders)
+		merged := cloneStringMap(info.RequestHeaders)
+		for k, v := range input.Headers {
+			merged[k] = v
 		}
+		input.Headers = merged
 		return input, nil
 	}