Add real workspace channels

docs/TASKS/content/003-real-workspace-channels.md

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+# Task: Add real workspace channels
+
+## Feature
+
+`docs/FEATURES/channels.md`
+
+## Goal
+
+Replace frontend-derived fake channels with real workspace-owned channel records served by the backend API.
+
+## Scope
+
+- Add a backend `Channels` module with a `Channel` table.
+- Add list and create endpoints for workspace channels.
+- Seed development channels and align seeded content publication targets to those configured channel names.
+- Update the frontend channels store to load and create channels through the API.
+- Keep the Channels page UI shape intact.
+
+## Relevant Files
+
+- `backend/src/Socialize.Api/Data/AppDbContext.cs`
+- `backend/src/Socialize.Api/Modules/Channels/`
+- `backend/src/Socialize.Api/Infrastructure/Development/DevelopmentSeedExtensions.cs`
+- `frontend/src/features/channels/stores/channelsStore.js`
+- `docs/FEATURES/channels.md`
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+dotnet test backend/Socialize.slnx
+cd frontend
+npm run build
+```