ZSTAC-75952 set first created zone as default

[MatheMatrix]

Root Cause

When APICreateZoneMsg omits isDefault, ZoneManagerImpl initialized the zone as non-default and skipped the default-zone operation queue. As a result, the first manually or Wizard-created zone could remain non-default.

Fix

• Route zone creation with omitted isDefault through the default-zone queue.
• Mark the zone as default only when no active zone exists.
• Backfill one default zone during 5.5.28 upgrade if existing deployments have zones but no default zone.
• Add ZoneCase coverage for first zone creation without isDefault.

Verification

• compute module offline install passed.
• ZoneCase passed.
• SQL backfill procedure validated on a scratch zstack schema.

Resolves: ZSTAC-75952

sync from gitlab !10404

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📥 Commits

Reviewing files that changed from the base of the PR and between a2492ae and c296180.

📒 Files selected for processing (3)

• compute/src/main/java/org/zstack/compute/zone/ZoneManagerImpl.java
• conf/db/upgrade/V5.5.28__schema.sql
• test/src/test/groovy/org/zstack/test/integration/compute/ZoneCase.groovy

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Comment from gitlab:

检测到该PR状态为cannot_be_merged, 所以移除了REVIEWED标签