feat: deep-agent canvas, live observability, and multi-environment tooling

Self-hosted platform for building, testing, and shipping LangChain/LangGraph agents. Deep-agent sub-agents on the canvas, a live tracing/observability timeline, auto-provisioned built-in tools with import/export, per-environment tool variables, streamed evaluations, and per-user auth token forwarding.

.dockerignore

@@ -0,0 +1,20 @@
+**/node_modules
+**/.next
+**/.venv
+**/.data
+**/__pycache__
+**/*.pyc
+**/.pytest_cache
+**/.ruff_cache
+**/.mypy_cache
+**/*.egg-info
+**/.git
+**/*.db
+**/*.sqlite
+**/.env
+**/.env.local
+**/.DS_Store
+# The api/worker builds now use context '.', so the old apps/api/.dockerignore is dead (Docker
+# reads only the .dockerignore at the context root). Keep tests out of the api image (nothing
+# at runtime imports them); explicit path avoids over-matching a top-level 'tests'.
+apps/api/tests