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  filters out group IDs no longer active.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

frontend/src/constants/channel.ts

@@ -0,0 +1,22 @@
+/** Channel status values (must match service.Status* constants in Go). */
+export const CHANNEL_STATUS_ACTIVE = 'active' as const
+export const CHANNEL_STATUS_DISABLED = 'disabled' as const
+export type ChannelStatus = typeof CHANNEL_STATUS_ACTIVE | typeof CHANNEL_STATUS_DISABLED
+
+/** Billing mode values (must match service.BillingMode* constants in Go). */
+export const BILLING_MODE_TOKEN = 'token' as const
+export const BILLING_MODE_PER_REQUEST = 'per_request' as const
+export const BILLING_MODE_IMAGE = 'image' as const
+export type BillingMode =
+  | typeof BILLING_MODE_TOKEN
+  | typeof BILLING_MODE_PER_REQUEST
+  | typeof BILLING_MODE_IMAGE
+
+/** Billing-model-source values (must match service.BillingModelSource* constants in Go). */
+export const BILLING_MODEL_SOURCE_REQUESTED = 'requested' as const
+export const BILLING_MODEL_SOURCE_UPSTREAM = 'upstream' as const
+export const BILLING_MODEL_SOURCE_CHANNEL_MAPPED = 'channel_mapped' as const
+export type BillingModelSource =
+  | typeof BILLING_MODEL_SOURCE_REQUESTED
+  | typeof BILLING_MODEL_SOURCE_UPSTREAM
+  | typeof BILLING_MODEL_SOURCE_CHANNEL_MAPPED