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/app/schemas/network_drive.py

@@ -0,0 +1,105 @@
+"""
+網路硬碟 Schemas
+"""
+from datetime import datetime
+from typing import Optional
+from pydantic import Field, ConfigDict
+
+from app.schemas.base import BaseSchema, TimestampSchema
+
+
+class NetworkDriveBase(BaseSchema):
+    """網路硬碟基礎 Schema"""
+
+    quota_gb: int = Field(..., gt=0, description="配額 (GB)")
+    webdav_url: Optional[str] = Field(None, max_length=255, description="WebDAV 路徑")
+    smb_url: Optional[str] = Field(None, max_length=255, description="SMB 路徑")
+
+
+class NetworkDriveCreate(NetworkDriveBase):
+    """創建網路硬碟 Schema"""
+
+    employee_id: int = Field(..., description="員工 ID")
+    drive_name: str = Field(..., min_length=3, max_length=100, description="NAS 帳號名稱")
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "employee_id": 1,
+                "drive_name": "porsche.chen",
+                "quota_gb": 200,
+                "webdav_url": "https://nas.lab.taipei/webdav/porsche.chen",
+                "smb_url": "\\\\10.1.0.30\\porsche.chen"
+            }
+        }
+    )
+
+
+class NetworkDriveUpdate(BaseSchema):
+    """更新網路硬碟 Schema"""
+
+    quota_gb: Optional[int] = Field(None, gt=0)
+    webdav_url: Optional[str] = Field(None, max_length=255)
+    smb_url: Optional[str] = Field(None, max_length=255)
+    is_active: Optional[bool] = None
+
+
+class NetworkDriveInDB(NetworkDriveBase, TimestampSchema):
+    """資料庫中的網路硬碟 Schema"""
+
+    id: int
+    employee_id: int
+    drive_name: str
+    is_active: bool
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class NetworkDriveResponse(NetworkDriveInDB):
+    """網路硬碟響應 Schema"""
+
+    employee_name: Optional[str] = Field(None, description="員工姓名")
+    employee_username: Optional[str] = Field(None, description="員工基礎帳號")
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "id": 1,
+                "employee_id": 1,
+                "drive_name": "porsche.chen",
+                "quota_gb": 200,
+                "webdav_url": "https://nas.lab.taipei/webdav/porsche.chen",
+                "smb_url": "\\\\10.1.0.30\\porsche.chen",
+                "is_active": True,
+                "created_at": "2020-01-01T00:00:00",
+                "updated_at": "2020-01-01T00:00:00",
+                "employee_name": "陳保時",
+                "employee_username": "porsche.chen"
+            }
+        }
+    )
+
+
+class NetworkDriveListItem(BaseSchema):
+    """網路硬碟列表項 Schema"""
+
+    id: int
+    drive_name: str
+    quota_gb: int
+    is_active: bool
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class NetworkDriveQuotaUpdate(BaseSchema):
+    """更新配額 Schema"""
+
+    quota_gb: int = Field(..., gt=0, le=1000, description="新配額 (GB)")
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "quota_gb": 500
+            }
+        }
+    )