feat: social account toggle action, API, MCP + full test coverage
- Extract ToggleSocialAccount action from SocialController
- Add API endpoints: GET /social-accounts, PUT /social-accounts/{id}/toggle
- Add MCP tools: ListSocialAccountsTool, ToggleSocialAccountTool
- Fix all MCP tools: findOrFail → find + Response::error for graceful errors
- Fix MCP tools using $request->validated() without validate() call
- Fix return types to Response|ResponseFactory for error paths
- Add SocialAccountResource is_active/status fields (no tokens exposed)
- Add 43 MCP tests covering all 18 tools (CRUD, validation, cross-workspace)
- Add API response structure tests for posts, hashtags, labels, workspace
- Add API validation tests for post create/update, api-key expiry, label color
- Add API cross-workspace delete tests for hashtags and labels
- Add app validation tests for hashtag/label update, invite fields, password
- Add auth required tests for notifications, profile delete, api-keys index
- Add media reorder validation tests
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