feat: Add uv Docker, Postgres, and company linking

Introduces uv-based Docker workflow with non-root runtime, cached installs, and uv-run for web and Celery. Updates docker-compose to Postgres + Redis, loads .env, and removes source bind mount for reproducible builds.

Switches settings to use Postgres when env is present with SQLite fallback; broadens allowed hosts for containerized development. Adds psycopg2-binary and updates sample env for Redis in Docker.

Adds company scoping to external data models and links sessions during ingestion; provides management commands to seed a Jumbo company/users and sync external chat data into the dashboard.

Includes .dockerignore, TypeScript config and typings, and minor template/docs tweaks.

Requires database migration.

.env.sample

@@ -1,8 +1,20 @@
 # .env.sample - rename to .env and update with actual credentials
 # Django settings
+# Generate secret with e.g. `openssl rand -hex 32`
 DJANGO_SECRET_KEY=your-secure-secret-key
 DJANGO_DEBUG=True
 
+# Database configuration (optional - local development uses SQLite by default)
+# Uncomment these to use PostgreSQL locally:
+# DATABASE_URL=postgresql://postgres:postgres@localhost:5432/dashboard_db
+# POSTGRES_DB=dashboard_db
+# POSTGRES_USER=postgres
+# POSTGRES_PASSWORD=postgres
+# POSTGRES_HOST=localhost
+# POSTGRES_PORT=5432
+#
+# Note: Docker Compose automatically uses PostgreSQL via docker-compose.yml environment variables
+
 # External API credentials
 EXTERNAL_API_USERNAME=your-api-username
 EXTERNAL_API_PASSWORD=your-api-password
@@ -10,7 +22,7 @@ EXTERNAL_API_PASSWORD=your-api-password
 # Redis settings for Celery
 REDIS_URL=redis://localhost:6379/0
 CELERY_BROKER_URL=redis://localhost:6379/0
-CELERY_RESULT_BACKEND=redis://localhost:6379/0
+CELERY_RESULT_BACKEND=redis://redis:6379/0
 
 # Celery Task Schedule (in seconds)
 CHAT_DATA_FETCH_INTERVAL=3600