Add real workspace channels

docs/FEATURES/channels.md

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+# Channels
+
+Channels are configured social destinations inside a workspace. They represent the account, handle, page, feed, newsletter, or other publication destination where content will eventually be handed off for publishing.
+
+Channels are workspace-owned data. Organization-owned connectors may provide credentials for external systems, but the workspace owns which destinations are available for content planning.
+
+## Model
+
+A channel has:
+
+- `id`
+- `workspaceId`
+- `name`
+- `network`
+- optional `handle`
+- optional `externalUrl`
+- `createdAt`
+
+`network` is a controlled string matching the frontend channel network options:
+
+- `Instagram`
+- `TikTok`
+- `Facebook`
+- `LinkedIn`
+- `YouTube`
+- `X`
+- `Reddit`
+- `Website`
+
+Channel names must be unique inside a workspace for the same network.
+
+## Behavior
+
+- Authenticated users with workspace access can list channels for their active workspace.
+- Workspace managers can create channels.
+- Content planning uses configured channels as selectable destinations.
+- Development seed data should create real workspace channels instead of relying on content target labels as fake channels.
+
+## Not In Scope
+
+- External connector credentials.
+- Publishing directly to social networks.
+- Channel deletion, archiving, or editing.