List datasets available in the current tenant. Query Parameters: tags: Optional tag filter. Supports: - comma-separated in one param, e.g. tags=analytics,sales - repeated params, e.g. tags=analytics&tags=sales Matching uses OR (dataset has at least one of the provided tags). q: Optional search term (case-insensitive) applied to name and description. favorites: If true, only show datasets favorited by the current user. limit: Page size (default from settings, max from settings). offset: Page offset (default 0). Examples: - `GET /datasets` — List all datasets - `GET /datasets?tags=analytics` — List datasets with 'analytics' tag - `GET /datasets?tags=analytics,sales` — List datasets with 'analytics' OR 'sales' - `GET /datasets?tags=analytics&tags=sales` — List datasets with 'analytics' OR 'sales' - `GET /datasets?q=sales` — Search in name/description for 'sales' - `GET /datasets?q=data&tags=analytics` — Combined search + tag - `GET /datasets?favorites=true` — List only favorited datasets