feat(auth): 重构认证系统，引入 session 会话管理

- 新增 user_sessions 数据库表及 Alembic 迁移
- 实现 SessionService 会话生命周期管理（创建/刷新/撤销/清理）
- 认证流程改用 refresh token cookie + access token 双令牌模式
- 前端实现自动静默刷新、跨标签页同步及设备指纹
- 用户设置页新增会话管理和密码修改功能
- 管理员用户管理新增强制登出和会话查看
- 密码策略增强，支持强度校验和泄露检测
- OAuth 登录流程适配新会话机制
- 新增完整的单元测试和 API 测试覆盖

Closes #232

Co-authored-by: LewisPen <LewisPen@nyadoo.com>

alembic/versions/20260315_1200_f6e7d8c9b0a1_add_user_sessions_table.py

@@ -0,0 +1,87 @@
+"""add user sessions table for device-level auth
+
+Revision ID: f6e7d8c9b0a1
+Revises: b7e8f9a0c1d2
+Create Date: 2026-03-15 12:00:00.000000+00:00
+
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "f6e7d8c9b0a1"
+down_revision = "b7e8f9a0c1d2"
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    bind = op.get_bind()
+    inspector = sa.inspect(bind)
+    if "user_sessions" in inspector.get_table_names():
+        return
+
+    op.create_table(
+        "user_sessions",
+        sa.Column("id", sa.String(length=36), nullable=False),
+        sa.Column("user_id", sa.String(length=36), nullable=False),
+        sa.Column("client_device_id", sa.String(length=128), nullable=False),
+        sa.Column("device_label", sa.String(length=120), nullable=True),
+        sa.Column("device_type", sa.String(length=20), nullable=False, server_default="unknown"),
+        sa.Column("browser_name", sa.String(length=50), nullable=True),
+        sa.Column("browser_version", sa.String(length=50), nullable=True),
+        sa.Column("os_name", sa.String(length=50), nullable=True),
+        sa.Column("os_version", sa.String(length=50), nullable=True),
+        sa.Column("device_model", sa.String(length=100), nullable=True),
+        sa.Column("ip_address", sa.String(length=45), nullable=True),
+        sa.Column("user_agent", sa.String(length=1000), nullable=True),
+        sa.Column("client_hints", sa.JSON(), nullable=True),
+        sa.Column("refresh_token_hash", sa.String(length=64), nullable=False),
+        sa.Column("prev_refresh_token_hash", sa.String(length=64), nullable=True),
+        sa.Column("rotated_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column(
+            "last_seen_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()
+        ),
+        sa.Column("expires_at", sa.DateTime(timezone=True), nullable=False),
+        sa.Column("revoked_at", sa.DateTime(timezone=True), nullable=True),
+        sa.Column("revoke_reason", sa.String(length=100), nullable=True),
+        sa.Column(
+            "created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()
+        ),
+        sa.Column(
+            "updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()
+        ),
+        sa.ForeignKeyConstraint(["user_id"], ["users.id"], ondelete="CASCADE"),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index("ix_user_sessions_user_id", "user_sessions", ["user_id"], unique=False)
+    op.create_index(
+        "ix_user_sessions_client_device_id",
+        "user_sessions",
+        ["client_device_id"],
+        unique=False,
+    )
+    op.create_index(
+        "idx_user_sessions_user_active",
+        "user_sessions",
+        ["user_id", "revoked_at", "expires_at"],
+        unique=False,
+    )
+    op.create_index(
+        "idx_user_sessions_user_device",
+        "user_sessions",
+        ["user_id", "client_device_id"],
+        unique=False,
+    )
+
+
+def downgrade() -> None:
+    op.drop_index("idx_user_sessions_user_device", table_name="user_sessions")
+    op.drop_index("idx_user_sessions_user_active", table_name="user_sessions")
+    op.drop_index("ix_user_sessions_client_device_id", table_name="user_sessions")
+    op.drop_index("ix_user_sessions_user_id", table_name="user_sessions")
+    op.drop_table("user_sessions")