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.

dashboard_project/data_integration/models.py

@@ -1,10 +1,19 @@
 import os
 
+from accounts.models import Company
 from django.db import models
 
 
 class ChatSession(models.Model):
     session_id = models.CharField(max_length=255, unique=True)
+    company = models.ForeignKey(
+        Company,
+        on_delete=models.CASCADE,
+        related_name="external_chat_sessions",
+        null=True,
+        blank=True,
+        help_text="Company this session belongs to",
+    )
     start_time = models.DateTimeField()
     end_time = models.DateTimeField()
     ip_address = models.GenericIPAddressField(null=True, blank=True)
@@ -39,7 +48,15 @@ class ChatMessage(models.Model):
 
 class ExternalDataSource(models.Model):
     name = models.CharField(max_length=255, default="External API")
-    api_url = models.URLField(default="<https://proto.notso.ai/jumbo/chats>")
+    company = models.ForeignKey(
+        Company,
+        on_delete=models.CASCADE,
+        related_name="external_data_sources",
+        null=True,
+        blank=True,
+        help_text="Company this data source belongs to",
+    )
+    api_url = models.URLField(default="https://proto.notso.ai/jumbo/chats")
     auth_username = models.CharField(max_length=255, blank=True, null=True)
     auth_password = models.CharField(
         max_length=255, blank=True, null=True