Add DC Hub Intelligence (data center / energy market intelligence) to community servers

[azmartone67]

DC Hub provides a hosted Streamable-HTTP MCP server for real-time data
center intelligence. Free tier requires no setup.

Endpoint: https://dchub.cloud/mcp
Manifest: https://dchub.cloud/api/v1/mcp/manifest
Tools: 50+ covering facility search, M&A transactions, ISO/RTO grid data
(10 ISOs, 102 zones — US + Canada + Mexico), capacity pipeline (21+ GW),
site-suitability scoring for any US lat/long.

Why this is useful for the community list:

• Hosted (no install / npm step) — agents can connect immediately
• Real-world data set (20,000+ facilities, 975+ deals, 10 ISOs)
• Tested with Claude Desktop, Claude Code, Cursor, ChatGPT, Continue
• Open API + manifest discovery — fits the MCP discovery convention
• Free tier exists; paid tier ($12/mo) for deeper queries

Suggested README entry (under community servers):

```md
DC Hub Intelligence — Data center
intelligence: 20K+ facilities, M&A tracking, grid analytics, site
scoring. Hosted Streamable-HTTP. (Apache-2.0, https://github.com/azmartone67/dchub-backend)
```

Open to filing a PR with the README edit if preferred — opened this
issue first per the contribution flow so maintainers can confirm
placement and category.

[rehan243]

Data engineering is the foundation everything else depends on. Our setup:

• Idempotent pipelines: Every pipeline stage is idempotent and restartable —
  this saved us during several production incidents
• Schema evolution: We version all schemas and validate at pipeline boundaries.
  Breaking schema changes require explicit migration steps
• Data quality gates: We run automated checks (completeness, freshness, distribution)
  at every stage. A failed check blocks downstream processing

Investing in data quality early paid massive dividends when we started scaling our ML workloads.