feat: add version manifest with all current image entries

[tsivaprasad]

Summary

This PR adds version-manifest.json, containing all image entries that are currently hardcoded in images.go and service_images.go. This change introduces only the manifest file and does not modify runtime behavior yet.

Changes

• Added server/internal/orchestrator/swarm/version-manifest.json with schema_version: 1
• Includes 15 PostgreSQL image entries covering pg16, pg17, and pg18 with spock5, with 18.4/spock5 configured as the default
• Added service image entries for postgrest (latest, 14.5), mcp (latest), and rag (latest)

Testing

Verified the JSON file

cat server/internal/orchestrator/swarm/version-manifest.json | \
  jq '[.images | to_entries[] | {type: .key, defaults: [.value[] | select(.default == true)] | length}]'
[
  {
    "type": "postgres",
    "defaults": 1
  },
  {
    "type": "postgrest",
    "defaults": 1
  },
  {
    "type": "mcp",
    "defaults": 1
  },
  {
    "type": "rag",
    "defaults": 1
  }
]

PLAT-597

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[tsivaprasad]

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[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

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