Add monitoring service and database schema

- Implement monitoring service with heartbeat, lease tasks, resume tasks, and task result handling.
- Create monitoring time utilities for business date calculations.
- Add unit tests for date window resolution and business day handling.
- Define database schema for monitoring-related tables including quotas, daily reports, and task management.
- Establish migration scripts for creating and dropping monitoring tables.

server/internal/tenant/app/monitoring_service_date_test.go

@@ -0,0 +1,67 @@
+package app
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/geo-platform/tenant-api/internal/shared/response"
+)
+
+func TestResolveDashboardDateWindowAtUsesBusinessTimezone(t *testing.T) {
+	loc := time.FixedZone("CST", 8*60*60)
+	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)
+
+	startDate, endDate, err := resolveDashboardDateWindowAt(7, "2026-04-12", now, loc)
+	require.NoError(t, err)
+
+	assert.Equal(t, time.Date(2026, 4, 6, 0, 0, 0, 0, loc), startDate)
+	assert.Equal(t, time.Date(2026, 4, 12, 0, 0, 0, 0, loc), endDate)
+}
+
+func TestResolveDashboardDateWindowAtRejectsFutureBusinessDay(t *testing.T) {
+	loc := time.FixedZone("CST", 8*60*60)
+	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)
+
+	_, _, err := resolveDashboardDateWindowAt(7, "2026-04-13", now, loc)
+	require.Error(t, err)
+
+	appErr := response.Normalize(err)
+	assert.Equal(t, 40031, appErr.Code)
+	assert.Equal(t, "invalid_business_date", appErr.Message)
+	assert.Equal(t, "business_date must not be later than today", appErr.Detail)
+}
+
+func TestParseDetailDateRangeAtDefaultsToCurrentBusinessDay(t *testing.T) {
+	loc := time.FixedZone("CST", 8*60*60)
+	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)
+
+	fromDate, toDate, err := parseDetailDateRangeAt("", "", now, loc)
+	require.NoError(t, err)
+
+	expected := time.Date(2026, 4, 12, 0, 0, 0, 0, loc)
+	assert.Equal(t, expected, fromDate)
+	assert.Equal(t, expected, toDate)
+}
+
+func TestMonitoringBusinessDayAndDateAtUsesShanghaiTimezone(t *testing.T) {
+	now := time.Date(2026, 4, 11, 17, 19, 0, 0, time.UTC)
+
+	businessDay, businessDate := monitoringBusinessDayAndDateAt(now)
+
+	assert.Equal(t, time.Date(2026, 4, 12, 0, 0, 0, 0, monitoringBusinessLocation()), businessDay)
+	assert.Equal(t, "2026-04-12", businessDate)
+}
+
+func TestEncodeMonitoringProjectionRebuildEnvelopePreservesBusinessDate(t *testing.T) {
+	businessDay := time.Date(2026, 4, 12, 0, 0, 0, 0, monitoringBusinessLocation())
+
+	payload, err := encodeMonitoringProjectionRebuildEnvelope(1, 2, businessDay, "test")
+	require.NoError(t, err)
+
+	envelope, err := decodeMonitoringProjectionRebuildEnvelope(payload)
+	require.NoError(t, err)
+	assert.Equal(t, "2026-04-12", envelope.BusinessDate)
+}