fix: merge 30 general improvements from release branch

Bug fixes:
- Detached context for GetAccountConcurrencyBatch (prevent all-zero on request cancel)
- Filter soft-deleted users in GetByGroupID
- Stripe CSP policy (allow Stripe.js in script-src and frame-src)
- WebSearch API key validation on save
- RECHARGING status in payment result success check
- Windows test fixes (logger Sync deadlock, config path escaping)

Feature enhancements:
- Webhook multi-instance dispatch (extractOutTradeNo + GetWebhookProvider)
- EasyPay mobile H5 payment (device param + PayURL2)
- SSE error propagation in WebSearch emulation
- AccountStatsCost DTO field for admin usage logs
- Plans sort by sort_order instead of created_at
- UsageMapHook for streaming response usage data
- apicompat Instructions field passthrough
- EffectiveLoadFactor for ops concurrency/metrics
- Usage billing RETURNING balance for notify system
- BulkUpdate mixed channel warning with details
- println to slog migration in auth cache
- Wire ProviderSet cleanup
- CI cache-dependency-path optimization

Frontend:
- Refund eligibility check per provider (canRequestRefund)
- Plan sort_order editing
- Dead code cleanup (simulate_claude_max, client_affinity)
- GroupsView platform switch guard
- channels features_config API type
- UsageView account_stats_cost export

backend/internal/service/channel_service.go

@@ -81,9 +81,9 @@ type wildcardMappingEntry struct {
 type channelCache struct {
 	// 热路径查找
 	pricingByGroupModel     map[channelModelKey]*ChannelModelPricing            // (groupID, platform, model) → 定价
-	wildcardByGroupPlatform map[channelGroupPlatformKey][]*wildcardPricingEntry // (groupID, platform) → 通配符定价（前缀长度降序）
+	wildcardByGroupPlatform map[channelGroupPlatformKey][]*wildcardPricingEntry // (groupID, platform) → 通配符定价（按配置顺序，先匹配先使用）
 	mappingByGroupModel     map[channelModelKey]string                          // (groupID, platform, model) → 映射目标
-	wildcardMappingByGP     map[channelGroupPlatformKey][]*wildcardMappingEntry // (groupID, platform) → 通配符映射（前缀长度降序）
+	wildcardMappingByGP     map[channelGroupPlatformKey][]*wildcardMappingEntry // (groupID, platform) → 通配符映射（按配置顺序，先匹配先使用）
 	channelByGroupID        map[int64]*Channel                                  // groupID → 渠道
 	groupPlatform           map[int64]string                                    // groupID → platform
 
@@ -680,6 +680,7 @@ func (s *ChannelService) Create(ctx context.Context, input *CreateChannelInput)
 		ModelPricing:               input.ModelPricing,
 		ModelMapping:               input.ModelMapping,
 		Features:                   input.Features,
+		FeaturesConfig:             input.FeaturesConfig,
 		ApplyPricingToAccountStats: input.ApplyPricingToAccountStats,
 		AccountStatsPricingRules:   input.AccountStatsPricingRules,
 	}
@@ -780,6 +781,9 @@ func (s *ChannelService) applyUpdateInput(ctx context.Context, channel *Channel,
 	if input.BillingModelSource != "" {
 		channel.BillingModelSource = input.BillingModelSource
 	}
+	if input.FeaturesConfig != nil {
+		channel.FeaturesConfig = input.FeaturesConfig
+	}
 	if input.ApplyPricingToAccountStats != nil {
 		channel.ApplyPricingToAccountStats = *input.ApplyPricingToAccountStats
 	}
@@ -959,6 +963,7 @@ type CreateChannelInput struct {
 	BillingModelSource         string
 	RestrictModels             bool
 	Features                   string
+	FeaturesConfig             map[string]any
 	ApplyPricingToAccountStats bool
 	AccountStatsPricingRules   []AccountStatsPricingRule
 }
@@ -974,6 +979,7 @@ type UpdateChannelInput struct {
 	BillingModelSource         string
 	RestrictModels             *bool
 	Features                   *string
+	FeaturesConfig             map[string]any
 	ApplyPricingToAccountStats *bool
 	AccountStatsPricingRules   *[]AccountStatsPricingRule
 }