feat: HR Portal - Complete Multi-Tenant System with Redis Session Storage

Major Features:
- ✅ Multi-tenant architecture (tenant isolation)
- ✅ Employee CRUD with lifecycle management (onboarding/offboarding)
- ✅ Department tree structure with email domain management
- ✅ Company info management (single-record editing)
- ✅ System functions CRUD (permission management)
- ✅ Email account management (multi-account per employee)
- ✅ Keycloak SSO integration (auth.lab.taipei)
- ✅ Redis session storage (10.1.0.254:6379)
  - Solves Cookie 4KB limitation
  - Cross-system session sharing
  - Sliding expiration (8 hours)
  - Automatic token refresh

Technical Stack:
Backend:
- FastAPI + SQLAlchemy
- PostgreSQL 16 (10.1.0.20:5433)
- Keycloak Admin API integration
- Docker Mailserver integration (SSH)
- Alembic migrations

Frontend:
- Next.js 14 (App Router)
- NextAuth 4 with Keycloak Provider
- Redis session storage (ioredis)
- Tailwind CSS

Infrastructure:
- Redis 7 (10.1.0.254:6379) - Session + Cache
- Keycloak 26.1.0 (auth.lab.taipei)
- Docker Mailserver (10.1.0.254)

Architecture Highlights:
- Session管理由 Keycloak + Redis 統一控制
- 支援多系統 (HR/WebMail/Calendar/Drive/Office) 共享 session
- Token 自動刷新,異質服務整合
- 未來可無縫遷移到雲端

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/test_triggers.py

@@ -0,0 +1,123 @@
+"""
+測試所有觸發器功能
+"""
+import psycopg2
+
+conn = psycopg2.connect(
+    host="10.1.0.20",
+    port=5433,
+    database="hr_portal",
+    user="admin",
+    password="DC1qaz2wsx"
+)
+conn.autocommit = False
+cur = conn.cursor()
+
+try:
+    print("=" * 60)
+    print("Test All Triggers")
+    print("=" * 60)
+
+    # ========================================
+    # Test 1: trigger_tenant_departments_seq_no
+    # ========================================
+    print("\n[Test 1] trigger_tenant_departments_seq_no")
+    
+    cur.execute("SELECT COALESCE(MAX(seq_no), 0) FROM tenant_departments WHERE tenant_id = 1;")
+    max_seq = cur.fetchone()[0]
+    print(f"   Current max seq_no: {max_seq}")
+    
+    cur.execute("""
+        INSERT INTO tenant_departments (tenant_id, code, name, depth)
+        VALUES (1, 'TEST_DEPT', 'Test Department', 0)
+        RETURNING seq_no;
+    """)
+    new_seq = cur.fetchone()[0]
+    print(f"   New seq_no (auto): {new_seq}")
+    print(f"   [PASS] {new_seq} == {max_seq + 1}")
+    
+    conn.rollback()
+
+    # ========================================
+    # Test 2: trigger_tenant_user_roles_seq_no
+    # ========================================
+    print("\n[Test 2] trigger_tenant_user_roles_seq_no")
+    
+    cur.execute("SELECT COALESCE(MAX(seq_no), 0) FROM tenant_user_roles WHERE tenant_id = 1;")
+    max_seq = cur.fetchone()[0]
+    print(f"   Current max seq_no: {max_seq}")
+    
+    cur.execute("""
+        INSERT INTO tenant_user_roles (tenant_id, role_code, role_name)
+        VALUES (1, 'TEST_ROLE', 'Test Role')
+        RETURNING seq_no;
+    """)
+    new_seq = cur.fetchone()[0]
+    print(f"   New seq_no (auto): {new_seq}")
+    print(f"   [PASS] {new_seq} == {max_seq + 1}")
+    
+    conn.rollback()
+
+    # ========================================
+    # Test 3: trigger_tenant_emp_resumes_seq_no
+    # ========================================
+    print("\n[Test 3] trigger_tenant_emp_resumes_seq_no")
+    
+    cur.execute("SELECT COALESCE(MAX(seq_no), 0) FROM tenant_emp_resumes WHERE tenant_id = 1;")
+    max_seq = cur.fetchone()[0]
+    print(f"   Current max seq_no: {max_seq}")
+    
+    cur.execute("""
+        INSERT INTO tenant_emp_resumes (tenant_id, legal_name, id_number)
+        VALUES (1, 'Test User', 'A123456789')
+        RETURNING id, seq_no;
+    """)
+    result = cur.fetchone()
+    resume_id = result[0]
+    new_seq = result[1]
+    print(f"   New seq_no (auto): {new_seq}")
+    print(f"   [PASS] {new_seq} == {max_seq + 1}")
+    
+    # ========================================
+    # Test 4&5: trigger_tenant_emp_settings_seq_no + trigger_generate_emp_code
+    # ========================================
+    print("\n[Test 4&5] auto seq_no + auto emp_code")
+    
+    cur.execute("SELECT COALESCE(MAX(seq_no), 0) FROM tenant_emp_settings WHERE tenant_id = 1;")
+    max_seq = cur.fetchone()[0]
+    print(f"   Current max seq_no: {max_seq}")
+    
+    cur.execute("SELECT prefix FROM tenants WHERE id = 1;")
+    prefix = cur.fetchone()[0]
+    print(f"   Tenant prefix: {prefix}")
+    
+    cur.execute("""
+        INSERT INTO tenant_emp_settings (tenant_id, tenant_resume_id, hire_at)
+        VALUES (1, %s, CURRENT_DATE)
+        RETURNING seq_no, tenant_emp_code;
+    """, (resume_id,))
+    result = cur.fetchone()
+    new_seq = result[0]
+    emp_code = result[1]
+    expected_code = f"{prefix}{str(new_seq).zfill(4)}"
+    
+    print(f"   New seq_no (auto): {new_seq}")
+    print(f"   New emp_code (auto): {emp_code}")
+    print(f"   Expected: {expected_code}")
+    print(f"   [PASS] seq_no: {new_seq} == {max_seq + 1}")
+    print(f"   [PASS] emp_code: {emp_code} == {expected_code}")
+    
+    conn.rollback()
+
+    print("\n" + "=" * 60)
+    print("ALL TESTS PASSED!")
+    print("=" * 60)
+
+except Exception as e:
+    conn.rollback()
+    print(f"\nERROR: {e}")
+    import traceback
+    traceback.print_exc()
+finally:
+    cur.close()
+    conn.close()