feat(channels): add "Available Channels" aggregate view

Add a read-only aggregate view per channel: its linked groups and a
deterministic wildcard-free supported-model list with pricing details.

Backend
- service.Channel.SupportedModels(): combine ModelMapping keys with
  same-platform ModelPricing.Models; trailing "*" keys expand via
  pricing prefix match; platforms without a mapping produce no
  entries (intentional "no mapping = not shown" rule).
- Extract splitWildcardSuffix() shared with toModelEntry.
- Build a per-call pricing lookup map (platform+lowerName -> *pricing)
  to avoid O(N*M) scans in SupportedModels.
- ChannelService.ListAvailable() aggregates channels + active groups;
  filters out group IDs no longer active.
- Admin route GET /api/v1/admin/channels/available returns the full
  DTO (id, status, billing_model_source, restrict_models, groups,
  supported_models).
- User route GET /api/v1/channels/available applies three filters:
  Status==active, visible-group intersection, and platform filter
  on supported_models (prevents cross-platform leak when a channel
  links to both a user-accessible group and an inaccessible one on
  another platform). Response is a plain array (matches the
  /groups/available sibling shape). Field whitelist omits
  billing_model_source, restrict_models, ids, status, sort_order.

Frontend
- New /admin/available-channels and /available-channels views backed
  by a shared AvailableChannelsTable component (admin adds status +
  billing-source columns via slots).
- PricingRow extracted to its own SFC; SupportedModelChip references
  shared billing-mode constants in constants/channel.ts.
- Sidebar: new entry above "渠道管理" for admin; matching entry in
  user nav.
- i18n: zh + en coverage for both namespaces.

Tests
- SupportedModels: wildcard-only pricing skipped, prefix-matches-
  nothing, cross-platform bleed, case-insensitive dedup, empty
  platform mapping.
- ListAvailable: nil groupRepo, inactive-group-ID dropped, stable
  case-insensitive name sort.
- User handler: 401 on unauthenticated, visible-group intersection,
  platform filter on supported_models, JSON whitelist.
- Admin handler: full DTO including default BillingModelSource
  fallback.

Refs: issue #1729

backend/internal/handler/handler.go

@@ -33,26 +33,28 @@ type AdminHandlers struct {
 	Channel                *admin.ChannelHandler
 	ChannelMonitor         *admin.ChannelMonitorHandler
 	ChannelMonitorTemplate *admin.ChannelMonitorRequestTemplateHandler
+	AvailableChannel       *admin.AvailableChannelHandler
 	Payment                *admin.PaymentHandler
 }
 
 // Handlers contains all HTTP handlers
 type Handlers struct {
-	Auth           *AuthHandler
-	User           *UserHandler
-	APIKey         *APIKeyHandler
-	Usage          *UsageHandler
-	Redeem         *RedeemHandler
-	Subscription   *SubscriptionHandler
-	Announcement   *AnnouncementHandler
-	ChannelMonitor *ChannelMonitorUserHandler
-	Admin          *AdminHandlers
-	Gateway        *GatewayHandler
-	OpenAIGateway  *OpenAIGatewayHandler
-	Setting        *SettingHandler
-	Totp           *TotpHandler
-	Payment        *PaymentHandler
-	PaymentWebhook *PaymentWebhookHandler
+	Auth             *AuthHandler
+	User             *UserHandler
+	APIKey           *APIKeyHandler
+	Usage            *UsageHandler
+	Redeem           *RedeemHandler
+	Subscription     *SubscriptionHandler
+	Announcement     *AnnouncementHandler
+	ChannelMonitor   *ChannelMonitorUserHandler
+	Admin            *AdminHandlers
+	Gateway          *GatewayHandler
+	OpenAIGateway    *OpenAIGatewayHandler
+	Setting          *SettingHandler
+	Totp             *TotpHandler
+	Payment          *PaymentHandler
+	PaymentWebhook   *PaymentWebhookHandler
+	AvailableChannel *AvailableChannelHandler
 }
 
 // BuildInfo contains build-time information