docs(backend): Mark Sprint 2 Story 1 Task 1 as completed

Task: Design AuditLog Database Schema and Create Migration

Deliverables:
- AuditLog entity with multi-tenant support
- EF Core configuration with JSONB columns
- Database migration with composite indexes
- Multi-tenant query filter

Status: completed (actual: 2 hours, estimated: 4 hours)
All acceptance criteria met.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

docs/plans/sprint_2_story_1_task_1.md

@@ -1,10 +1,12 @@
 ---
 task_id: sprint_2_story_1_task_1
 story: sprint_2_story_1
-status: in_progress
+status: completed
 estimated_hours: 4
+actual_hours: 2
 created_date: 2025-11-05
 start_date: 2025-11-05
+completion_date: 2025-11-05
 assignee: Backend Team
 ---
 
@@ -19,11 +21,11 @@ Design and implement the AuditLog database table schema with proper columns, dat
 
 ## Acceptance Criteria
 
-- [ ] Database migration created with AuditLog table
-- [ ] All required columns defined with correct data types
-- [ ] Composite indexes created for query optimization
-- [ ] Multi-tenant isolation enforced (TenantId column)
-- [ ] Migration applied successfully
+- [x] Database migration created with AuditLog table
+- [x] All required columns defined with correct data types
+- [x] Composite indexes created for query optimization
+- [x] Multi-tenant isolation enforced (TenantId column)
+- [x] Migration applied successfully
 
 ## Implementation Details