feat(task): add adaptor billing interface and async settlement framework

Add three billing lifecycle methods to the TaskAdaptor interface:
- EstimateBilling: compute OtherRatios from user request before pricing
- AdjustBillingOnSubmit: adjust ratios from upstream submit response
- AdjustBillingOnComplete: determine final quota at task terminal state

Introduce BaseBilling as embeddable no-op default for adaptors without
custom billing. Move Sora/Ali OtherRatios logic from shared validation
into per-adaptor EstimateBilling implementations.

Add TaskBillingContext to persist pricing params (model_price, group_ratio,
other_ratios) in task private data for async polling settlement.

Extract RecalculateTaskQuota as a general-purpose delta settlement
function and unify polling billing via settleTaskBillingOnComplete
(adaptor-first, then token-based fallback).

logger/logger.go

@@ -2,7 +2,6 @@ package logger
 
 import (
 	"context"
-	"encoding/json"
 	"fmt"
 	"io"
 	"log"
@@ -151,7 +150,7 @@ func FormatQuota(quota int) string {
 
 // LogJson 仅供测试使用 only for test
 func LogJson(ctx context.Context, msg string, obj any) {
-	jsonStr, err := json.Marshal(obj)
+	jsonStr, err := common.Marshal(obj)
 	if err != nil {
 		LogError(ctx, fmt.Sprintf("json marshal failed: %s", err.Error()))
 		return