API v1 Launch

Initial release of the PadStats Intelligence API v1.

New endpoints:

• POST /v1/avm/property — Single-family property valuations
• POST /v1/avm/rental — Rental rate estimates
• POST /v1/avm/multifamily — Small multifamily valuations
• POST /v1/avm/batch/* — Async batch jobs for high-volume workflows
• GET /v1/flood-zone — FEMA flood zone classifications
• GET /v1/fire-risk — Wildfire risk scores
• GET /v1/storm-surge — Hurricane storm surge zones
• GET /v1/census-data — ACS census demographics
• GET /v1/crime-data — Crime statistics
• GET /v1/socioeconomic-data — Socioeconomic indices
• GET /v1/natural-hazards — Combined natural hazard risk
• POST /v1/comprehensive — Multi-service combined response