docs(07-01): complete quick-add library backend plan

- Add 07-01-SUMMARY.md documenting migration, model, queries, and handlers
- Update STATE.md: progress 94%, decisions, session record
- Update ROADMAP.md: phase 7 in-progress with 1/2 plans complete
- Mark requirements QADD-01 and QADD-03 complete

.planning/phases/07-quick-add-library/07-01-SUMMARY.md

@@ -0,0 +1,107 @@
+---
+phase: 07-quick-add-library
+plan: "01"
+subsystem: api
+tags: [go, postgres, rest-api, crud]
+
+# Dependency graph
+requires:
+  - phase: 05-template-data-model-and-api
+    provides: Item tier enum and query patterns used as reference
+provides:
+  - quick_add_items table DDL via 003_quick_add_library.sql
+  - QuickAddItem Go struct with json tags
+  - ListQuickAddItems, CreateQuickAddItem, UpdateQuickAddItem, DeleteQuickAddItem query functions
+  - GET/POST /api/quick-add and PUT/DELETE /api/quick-add/{itemId} REST endpoints
+affects: [08-quick-add-frontend]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns: [user-scoped CRUD with sort_order auto-increment via subquery]
+
+key-files:
+  created:
+    - backend/migrations/003_quick_add_library.sql
+  modified:
+    - backend/internal/models/models.go
+    - backend/internal/db/queries.go
+    - backend/internal/api/handlers.go
+    - backend/internal/api/router.go
+
+key-decisions:
+  - "sort_order auto-incremented via (SELECT COALESCE(MAX(sort_order), 0) + 1 FROM quick_add_items WHERE user_id = $1) subquery at insert time"
+  - "ListQuickAddItems initializes empty slice (not nil) so API always returns [] not null"
+  - "UpdateQuickAddItem returns 404 via pgx.ErrNoRows check when no row matches id+user_id"
+
+patterns-established:
+  - "QuickAddItem CRUD follows Category/TemplateItem pattern: user_id in all WHERE clauses, fmt.Errorf wrapping, pgx row scanning"
+  - "Routes registered after template block in authenticated group, following chi.Route pattern"
+
+requirements-completed: [QADD-01, QADD-03]
+
+# Metrics
+duration: 1min
+completed: 2026-03-12
+---
+
+# Phase 07 Plan 01: Quick-Add Library Backend Summary
+
+**REST CRUD for quick_add_items table: migration, QuickAddItem model, four user-scoped query functions, four handlers at /api/quick-add**
+
+## Performance
+
+- **Duration:** 1 min
+- **Started:** 2026-03-12T13:12:57Z
+- **Completed:** 2026-03-12T13:13:57Z
+- **Tasks:** 2
+- **Files modified:** 4 (plus 1 created)
+
+## Accomplishments
+
+- Created 003_quick_add_library.sql with quick_add_items table and user index
+- Added QuickAddItem struct to models.go and four CRUD query functions to queries.go
+- Registered four HTTP handlers and routes under /api/quick-add inside authenticated group
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Migration, model, and query functions** - `84d5b76` (feat)
+2. **Task 2: HTTP handlers and route registration** - `b42f7b1` (feat)
+
+## Files Created/Modified
+
+- `backend/migrations/003_quick_add_library.sql` - DDL for quick_add_items table with user FK, sort_order, and index
+- `backend/internal/models/models.go` - Added QuickAddItem struct
+- `backend/internal/db/queries.go` - Added ListQuickAddItems, CreateQuickAddItem, UpdateQuickAddItem, DeleteQuickAddItem
+- `backend/internal/api/handlers.go` - Added four handler methods for quick-add CRUD
+- `backend/internal/api/router.go` - Registered /api/quick-add route group in authenticated section
+
+## Decisions Made
+
+- sort_order auto-incremented via subquery at INSERT time so client doesn't need to track current max
+- ListQuickAddItems returns initialized empty slice so JSON response is always `[]` not `null`
+- UpdateQuickAddItem maps pgx.ErrNoRows to 404 for user-friendly not-found behavior
+
+## Deviations from Plan
+
+None - plan executed exactly as written.
+
+## Issues Encountered
+
+None. Go binary was at `/home/jean-luc-makiola/go/go1.26.1/bin/go` (non-standard PATH), found and used correctly.
+
+## User Setup Required
+
+None - no external service configuration required.
+
+## Next Phase Readiness
+
+- Backend API complete and compiles cleanly
+- Database migration ready for 003 to be applied when deploying
+- Ready for Phase 08 frontend quick-add library UI
+
+---
+*Phase: 07-quick-add-library*
+*Completed: 2026-03-12*