feat: 修复 H5 底部导航覆盖 + 更新项目进度文档

## H5 底部导航修复 (Bug #10)
- 精简 App.vue，移除重复 tabbar，仅保留全局样式
- uni-page 设置 height: calc(100% - 50px) + overflow-y: auto
- 内容区域精确停在底部导航上方，独立滚动不再叠加
- 恢复 custom-tab-bar 组件

## 项目进度文档
- PROGRESS.md 更新至 10 个 Bug 修复
- 新增 H5 底部导航修复记录
- 新增历史变更条目

backend/alembic/versions/004_devices.py

@@ -0,0 +1,36 @@
+"""add devices table for push notification registration
+
+Revision ID: 004
+Revises: 003
+Create Date: 2026-05-10
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision: str = '004'
+down_revision: Union[str, None] = '003'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table('devices',
+        sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('user_id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('platform', sa.String(length=50), nullable=True),
+        sa.Column('push_token', sa.String(length=500), nullable=True),
+        sa.Column('client_id', sa.String(length=255), nullable=False),
+        sa.Column('device_info', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+        sa.Column('is_active', sa.Boolean(), nullable=True),
+        sa.Column('created_at', sa.DateTime(), nullable=True),
+        sa.Column('updated_at', sa.DateTime(), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_devices_user_id'), 'devices', ['user_id'], unique=False)
+
+
+def downgrade() -> None:
+    op.drop_table('devices')