fix: use "points" instead of "vertices" in region API test 05

[Copilot]

Test 05 in region_api.json was sending "vertices" as the coordinate field name when updating a region. RegionSerializer expects "points", so the coordinates were silently dropped and the test never validated that coordinate updates actually worked.

📝 Description

What: Renamed "vertices" → "points" in the test 05 ("Update region with full payload") request body in tests/api/scenarios/region_api.json.

Why: RegionSerializer only recognizes "points" — using "vertices" caused coordinates to be silently ignored, making the test a false positive that never exercised the coordinate-update code path.

// Before (silently ignored by RegionSerializer)
"vertices": [[0.0, 0.0], [2.0, 0.0], [2.0, 2.0], [0.0, 2.0]]

// After (correctly recognized)
"points": [[0.0, 0.0], [2.0, 0.0], [2.0, 2.0], [0.0, 2.0]]

✨ Type of Change

• 🐞 Bug fix – Non-breaking change which fixes an issue
• 🚀 New feature – Non-breaking change which adds functionality
• 🔨 Refactor – Non-breaking change which refactors the code base
• 💥 Breaking change – Changes that break existing functionality
• 📚 Documentation update
• 🔒 Security update
• 🧪 Tests
• 🚂 CI

🧪 Testing Scenarios

• ✅ Tested manually
• 🤖 Ran automated end-to-end tests

✅ Checklist

Before submitting the PR, ensure the following:

• 🔍 PR title is clear and descriptive
• 📝 For internal contributors: If applicable, include the JIRA ticket number (e.g., ITEP-123456) in the PR title. Do not include full URLs
• 💬 I have commented my code, especially in hard-to-understand areas
• 📄 I have made corresponding changes to the documentation
• ✅ I have added tests that prove my fix is effective or my feature works

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.