Image scraping + Postgres env vars + search results include images

- _fetch_and_index now extracts img src URLs, filters junk, stores in OpenSearch
- get_db() uses PGHOST/PGUSER/etc env vars for Docker compatibility
- search endpoint returns images + image_count in hits
- Docker run command passes all PG env vars
- Discovery script runs via SSH to CT to avoid VPN issues

docker-compose.yml

@@ -56,7 +56,46 @@ services:
       timeout: 5s
       retries: 3
 
+  # ── Database ───────────────────────────────────────────────
+  postgres:
+    image: postgres:16-alpine
+    container_name: postgres
+    environment:
+      - POSTGRES_USER=research
+      - POSTGRES_PASSWORD=ResearchDB2026!
+      - POSTGRES_DB=research_engine
+    ports:
+      - "5432:5432"
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "pg_isready", "-U", "research"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+
+  # ── API + Dashboard ────────────────────────────────────────
+  backend:
+    build: .
+    container_name: research-backend
+    network_mode: host
+    restart: unless-stopped
+    depends_on:
+      opensearch:
+        condition: service_healthy
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
 volumes:
   yacy_data:
   opensearch_data:
   redis_data:
+  postgres_data: