fix: correct healthchecks and env variable handling for custom ports

- Fix healthchecks to use internal ports (8080, 8081, 8082, 7700) instead of external ports
- Remove variable expansion from healthcheck URLs (not supported in compose)
- Update .env.example to clarify internal vs external ports
- Ensure DATABASE_URL always uses internal PostgreSQL port (5432)
- Services now correctly start with custom external port mappings

.env.example

@@ -19,6 +19,7 @@ API_BOOTSTRAP_TOKEN=change-me-in-production
 
 # =============================================================================
 # Port Configuration (change only if you have port conflicts)
+# Update both the PORT variable AND the URL variables below
 # =============================================================================
 
 # Main application ports
@@ -31,25 +32,27 @@ MEILI_PORT=7700
 POSTGRES_PORT=5432
 
 # =============================================================================
-# Service URLs (auto-generated from ports above - don't change unless you know what you're doing)
+# Service URLs (update these when you change ports above!)
 # =============================================================================
 
 # API Service
-API_LISTEN_ADDR=0.0.0.0:${API_PORT}
-API_BASE_URL=http://api:${API_PORT}
+API_LISTEN_ADDR=0.0.0.0:8080
+API_BASE_URL=http://api:8080
 
 # Indexer Service  
-INDEXER_LISTEN_ADDR=0.0.0.0:${INDEXER_PORT}
+INDEXER_LISTEN_ADDR=0.0.0.0:8081
 INDEXER_SCAN_INTERVAL_SECONDS=5
 
 # Backoffice Web UI
 # Uses BACKOFFICE_PORT from above
 
 # Meilisearch Search Engine
-MEILI_URL=http://meilisearch:${MEILI_PORT}
+MEILI_URL=http://meilisearch:7700
 
 # PostgreSQL Database
-DATABASE_URL=postgres://stripstream:stripstream@postgres:${POSTGRES_PORT}/stripstream
+# Note: Always use port 5432 here (internal Docker port)
+# Change POSTGRES_PORT above only for the external mapping
+DATABASE_URL=postgres://stripstream:stripstream@postgres:5432/stripstream
 
 # =============================================================================
 # Storage Configuration