feat: Add pipeline execution UI, stage metrics, and API proxy routes

- Add run pipeline page with job selection UI
- Add execution detail page with stage metrics visualization
- Add stage_metrics and total_duration_ms to pipeline.executions table
- Create Next.js API proxy routes for all pipeline endpoints
- Fix trailing slash issues in pipeline-api.ts URLs
- Add Docker volume mounts for pipeline packages
- Add REVIEWIQ_DATABASE_URL and LLM API keys to docker-compose
- Fix JSONB field parsing in execution detail endpoint

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.production.yml

@@ -37,6 +37,16 @@ services:
       # Chromium/Xvfb configuration
       - DISPLAY=:99
       - CHROME_BIN=/usr/bin/chromium
+      # Pipeline packages path
+      - PYTHONPATH=/app:/app/packages/pipeline-core/src:/app/packages/reviewiq-pipeline/src
+      # ReviewIQ pipeline database URL (same DB, pipeline schema)
+      - REVIEWIQ_DATABASE_URL=postgresql://scraper:${DB_PASSWORD:-scraper123}@db:5432/scraper
+      # ReviewIQ LLM API keys
+      - REVIEWIQ_OPENAI_API_KEY=${OPENAI_API_KEY:-}
+      - REVIEWIQ_ANTHROPIC_API_KEY=${ANTHROPIC_API_KEY:-}
+    volumes:
+      - ./packages:/app/packages:ro
+      - ./api:/app/api:ro
     ports:
       - "8000:8000"
       - "5900:5900"   # VNC port (for VNC client)