WP-00 Shared HTTP and persistence scaffold

Load AGENTS.md, contracts.md, and api-map.md first. Tech specs: api/common.md, app/common.md, exchange/common.md. Implement only when the user asks.

Group G0. No other feature package starts before this lands.

Owns

• afia-api/src/main/java/health/afia/app/common/EndpointUri.java
• afia-api/src/main/java/health/afia/app/common/ApiEnvelope.java
• afia-api/src/main/resources/db/
• afia-api/src/main/resources/application.properties
• afia-app/lib/core/const/api_config.dart
• ai-agent/docs/api-map.md

Features F-18 and F-19 are already live. Keep those two paths working.

Must not write

• Any health.afia.app.identity, patient, clinician, diagnostics, or admin package
• Flutter presentation/ feature folders
• Stitch exports or invented screens

Depends on

Nothing. This is the first implementation package.

Done when

1. EndpointUri has constants for every row in manifest/api-prefixes.tsv.
2. ApiConfig copies those paths. It does not invent new ones.
3. docs/api-map.md lists each reserved path and its owner work package.
4. Persistence rule from ADR 0003 is in application.properties when the first write lands. Use Postgres and Liquibase. Set ddl-auto=none.
5. GET /api/v1/afia/health and GET /api/v1/afia/app-version still pass their existing tests.
6. cd afia-api && mvn test passes.
7. cd afia-app && flutter test passes.
8. After you edit docs/api-map.md or the pack, python3 ai-agent/scripts/check-agent-pack.py prints PASS.

Do not invent screens

This package has no UI beyond the current health check. Leave Flutter home as it is unless the user asks to keep the health button.