Add comprehensive admin features and multi-system integration

- Add admin dashboard with sync controls and data browser
- Implement RMM, Auvik, and Addigy organization mappings
- Add chunked ticket sync with progress tracking
- Implement entity sync service with rate limiting
- Add analytics engine and performance optimizer
- Create data browser for all PSA entities
- Add navigation components and UI improvements
- Implement background processing and sync services
- Add comprehensive documentation and migration scripts
- Update configuration items with multi-system support
- Enhance contact management and purchase history
- Add issue type assignment and LLM analyzer
- Improve error handling and logging utilities

migrations/007_remove_time_entries_foreign_keys.sql

@@ -0,0 +1,16 @@
+-- Remove all foreign key constraints from time_entries table
+-- This allows syncing time entries without requiring related entities to exist first
+
+-- Drop all foreign key constraints
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_resource_id_fkey;
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_ticket_id_fkey;
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_task_id_fkey;
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_project_id_fkey;
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_company_id_fkey;
+ALTER TABLE time_entries DROP CONSTRAINT IF EXISTS time_entries_approved_by_resource_id_fkey;
+
+-- Also make resource_id nullable since we're removing constraints
+ALTER TABLE time_entries ALTER COLUMN resource_id DROP NOT NULL;
+
+-- Comments
+COMMENT ON TABLE time_entries IS 'Autotask time entries - foreign key constraints removed to allow flexible syncing';