- Switch default repository to start empty when Postgres is configured;
GraphDataLoaderHostedService loads real data from graph.graph_nodes/edges
on startup and refreshes every 5 minutes
- Keep InMemoryGraphRepository with hardcoded seed as fallback when no DB
- Add Reload() method to InMemoryGraphRepository for hot-swapping data
- Add GetAllNodesAsync/GetAllEdgesAsync to PostgresGraphRepository
- Deprecate hardcoded seed data in InMemoryGraphRepository
- Fix graph-api port mismatch: container listens on 8080 (ASPNETCORE_URLS)
but compose mapped 80:80; corrected to 80:8080 + healthcheck to 8080
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>