docs: add saved filters implementation plan

Add comprehensive implementation plan for generic saved filters feature:
- Generic /api/saved-filters endpoint with resource_type field
- Service layer architecture with business logic
- JSONB storage for flexible filter schemas
- Integration test patterns
- Support for both JSON (API) and HTML (HTMX) responses
- Database schema with auto-updating updated_at trigger

This plan follows PROJECT_GUIDELINES.md and matches existing codebase patterns
(service layer, handler constructors, error handling, testing patterns).

Related to bookshelf page save filter functionality.
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2026-03-20 22:57:55 -04:00
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commit 09449eff39
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