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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