Implement Transaction Tagging and Categorization

[MerlinTheWhiz]

Closes #467

Changes I made:

• transaction.entity.ts — Added category and tags.
• transaction-response.dto.ts — Included category and tags in responses.
• transaction-query.dto.ts — Added filters for category and tags.
• tag-transaction.dto.ts, bulk-tag.dto.ts — New DTOs for tagging.
• transactions.controller.ts — Added tagging, bulk tagging, and category endpoints.
• transactions.service.ts — Added filtering, tagging logic, and CSV export support for category/tags.
• auto-categorization.service.ts — Added rule-based categorization.
• transactions.module.ts — Registered auto-categorization provider.
• 1780000000000-AddTransactionTagsAndCategory.ts — Migration for category/tags.
• transactions.service.tagging.spec.ts — Added service-level unit tests for tagging features

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nestera	Ready	Preview, Comment	Mar 29, 2026 0:15am

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