web: migrate health notifications to js_interop; add browser hook

- Replace dart:js with package:js in health_check_service_web.dart\n- Implement showHealthCheckNotification in web/index.html\n- Pin js dependency to ^0.6.7 for flutter_secure_storage_web compatibility

auth: harden AuthInterceptor + tests

- Allow overrideAuthRepository injection for testing\n- Normalize imports to package: paths\n- Add unit test covering token attach, 401→refresh→retry, and failure path\n- Add integration test skeleton gated by env vars

ui/data: map User.companyName to list column

- Add companyName to domain User\n- Map UserDto.company?.name\n- Render companyName in user_list

cleanup: remove legacy equipment table + unused code; minor warnings

- Remove _buildFlexibleTable and unused helpers\n- Remove unused zipcode details and cache retry constant\n- Fix null-aware and non-null assertions\n- Address child-last warnings in administrator dialog

docs: update AGENTS.md session context

.claude/agents/db-patterns.md

@@ -0,0 +1,76 @@
+# Superport Database Patterns v8.0
+
+## What This Really Is
+Database queries and schema patterns. PostgreSQL specific.
+
+## Main Tables
+```sql
+-- Core entities
+equipment (
+  id SERIAL PRIMARY KEY,
+  serial_number VARCHAR UNIQUE,
+  models_id INT REFERENCES models(id),
+  companies_id INT REFERENCES companies(id),
+  status VARCHAR
+)
+
+equipment_history (
+  id SERIAL PRIMARY KEY,
+  equipments_id INT REFERENCES equipment(id),
+  transaction_type CHAR(1), -- 'I'(입고), 'O'(출고)
+  warehouses_id INT,
+  transacted_at TIMESTAMP
+)
+
+maintenance (
+  id SERIAL PRIMARY KEY,
+  equipment_history_id INT,
+  maintenance_type VARCHAR, -- WARRANTY, CONTRACT, INSPECTION
+  expiry_date DATE
+)
+```
+
+## Common Queries
+```sql
+-- Equipment with latest location
+SELECT e.*, w.name as warehouse_name
+FROM equipment e
+LEFT JOIN LATERAL (
+  SELECT warehouses_id 
+  FROM equipment_history
+  WHERE equipments_id = e.id
+  ORDER BY transacted_at DESC
+  LIMIT 1
+) eh ON true
+LEFT JOIN warehouses w ON w.id = eh.warehouses_id;
+
+-- Maintenance due in 30 days
+SELECT m.*, e.serial_number
+FROM maintenance m
+JOIN equipment_history eh ON m.equipment_history_id = eh.id
+JOIN equipment e ON eh.equipments_id = e.id
+WHERE m.expiry_date <= CURRENT_DATE + INTERVAL '30 days'
+  AND m.expiry_date >= CURRENT_DATE;
+```
+
+## Indexes
+```sql
+-- Add these for performance
+CREATE INDEX idx_equipment_history_equipments ON equipment_history(equipments_id);
+CREATE INDEX idx_equipment_history_transacted ON equipment_history(transacted_at DESC);
+CREATE INDEX idx_maintenance_expiry ON maintenance(expiry_date);
+```
+
+## Transaction Pattern
+```sql
+BEGIN;
+-- Insert equipment
+INSERT INTO equipment (serial_number, models_id) VALUES ($1, $2) RETURNING id;
+-- Insert history
+INSERT INTO equipment_history (equipments_id, transaction_type, warehouses_id) 
+VALUES ($id, 'I', $3);
+COMMIT;
+```
+
+---
+*Backend handles all DB logic. Frontend never touches SQL.*