new label feature optimization

[kavyashri-as]

Overview\n\nThis issue tracks optimization opportunities for the label feature in the Task Manager app.\n\n## Areas to Optimize\n\n- enrichTasksWithLabels helper: Currently makes N individual getTaskLabels DB calls (one per task). This should be batched into a single query to reduce database round-trips.\n- Label assignment: Bulk assign/remove labels to tasks in a single transaction instead of individual calls.\n- Caching: Consider caching frequently accessed labels to avoid redundant DB reads.\n\n## Expected Outcome\n\n- Reduced database queries when loading tasks with labels\n- Improved response times for /api/tasks and / endpoints\n- Cleaner, more scalable label-fetching logic

[IY-06]

你好，看到你的label feature优化需求。

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