feat(alerts): 添加微信告警、WebSocket实时推送和地图功能

- 新增微信告警服务（wechat_service）和告警任务（alert_tasks）
- 新增 WebSocket 实时推送端点
- 新增监控管理模块（monitor）
- 增强统计仪表板：趋势图、区域分布、光功率历史
- 设备管理：添加坐标信息、标签系统、复合索引优化
- 前端：重构Dashboard/Charts页面，新增业务组件
- 新增5个数据库迁移（坐标、复合索引、标签、光功率历史、显示名）
- 更新部署配置和脚本
- 新增测试框架基础结构

backend/alembic/versions/i9j0k1l2m3n4_add_onu_coordinates.py

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+"""add latitude and longitude columns to onu_devices
+
+Revision ID: i9j0k1l2m3n4
+Revises: h8i9j0k1l2m3
+Create Date: 2026-06-02 12:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'i9j0k1l2m3n4'
+down_revision: Union[str, None] = 'h8i9j0k1l2m3'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('onu_devices', sa.Column('latitude', sa.Float(), nullable=True))
+    op.add_column('onu_devices', sa.Column('longitude', sa.Float(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('onu_devices', 'longitude')
+    op.drop_column('onu_devices', 'latitude')

backend/alembic/versions/j0k1l2m3n4o5_add_composite_indexes.py

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+"""add composite indexes for performance
+
+Revision ID: j0k1l2m3n4o5
+Revises: i9j0k1l2m3n4
+Create Date: 2026-06-02 15:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+
+revision: str = 'j0k1l2m3n4o5'
+down_revision: Union[str, None] = 'i9j0k1l2m3n4'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # FK 索引 — 每次状态检查都要按 OLT 查询设备
+    op.create_index('ix_onu_devices_olt_id', 'onu_devices', ['olt_id'])
+    # 复合索引 — Dashboard 按区域+学校聚合
+    op.create_index('ix_onu_devices_region_school', 'onu_devices', ['region', 'school_name'])
+    # FK 索引 — DeviceStatusHistory 按设备查最新状态（最频繁的查询）
+    op.create_index('ix_device_status_history_onu_device_id_checked', 'device_status_history', ['onu_device_id', 'checked_at'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_device_status_history_onu_device_id_checked', table_name='device_status_history')
+    op.drop_index('ix_onu_devices_region_school', table_name='onu_devices')
+    op.drop_index('ix_onu_devices_olt_id', table_name='onu_devices')

backend/alembic/versions/k0l1m2n3o4p5_add_device_tags.py

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+"""add tags column to onu_devices
+
+Revision ID: k0l1m2n3o4p5
+Revises: j0k1l2m3n4o5
+Create Date: 2026-06-03 10:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'k0l1m2n3o4p5'
+down_revision: Union[str, None] = 'j0k1l2m3n4o5'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('onu_devices', sa.Column('tags', sa.Text(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('onu_devices', 'tags')

backend/alembic/versions/l1m2n3o4p5q6_add_optical_power_history.py

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+"""add optical_power_history table
+
+Revision ID: l1m2n3o4p5q6
+Revises: k0l1m2n3o4p5
+Create Date: 2026-06-03 11:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'l1m2n3o4p5q6'
+down_revision: Union[str, None] = 'k0l1m2n3o4p5'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table('optical_power_history',
+        sa.Column('id', sa.BigInteger(), nullable=False),
+        sa.Column('onu_device_id', sa.BigInteger(), sa.ForeignKey('onu_devices.id'), nullable=False),
+        sa.Column('power_in', sa.String(20), nullable=True),
+        sa.Column('power_out', sa.String(20), nullable=True),
+        sa.Column('recorded_at', sa.TIMESTAMP(), server_default=sa.text('now()'), nullable=False),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index('ix_optical_power_history_id', 'optical_power_history', ['id'])
+    op.create_index('ix_optical_power_history_onu_device_id', 'optical_power_history', ['onu_device_id'])
+
+
+def downgrade() -> None:
+    op.drop_index('ix_optical_power_history_onu_device_id', table_name='optical_power_history')
+    op.drop_index('ix_optical_power_history_id', table_name='optical_power_history')
+    op.drop_table('optical_power_history')

backend/alembic/versions/m1n2o3p4q5r6_add_user_display_name.py

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+"""add display_name to users
+
+Revision ID: m1n2o3p4q5r6
+Revises: l1m2n3o4p5q6
+Create Date: 2026-06-03 20:00:00.000000
+
+"""
+from typing import Sequence, Union
+from alembic import op
+import sqlalchemy as sa
+
+revision: str = 'm1n2o3p4q5r6'
+down_revision: Union[str, None] = 'l1m2n3o4p5q6'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column('users', sa.Column('display_name', sa.String(100), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column('users', 'display_name')