feat: enhance Docker support with production setup and deployment script (#1086)

* feat: add `make start` command for local previewing

* Update Makefile

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* fix: update help text for `make dev` and `make start` commands

* feat: enhance Docker support with production setup and deployment script

* feat: add production commands to Makefile

* feat: remove PostgreSQL and Redis services from Docker Compose and update deploy script

* fix: address Copilot review suggestions from Docker production PR #1086 (#10)

* Initial plan

* fix: address all review suggestions from PR #1086

Co-authored-by: foreleven <4785594+foreleven@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: foreleven <4785594+foreleven@users.noreply.github.com>

* Update docker/docker-compose.yaml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* feat: remove deprecated Dockerfile.langgraph to clean up repository

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Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: foreleven <4785594+foreleven@users.noreply.github.com>
Co-authored-by: Willem Jiang <willem.jiang@gmail.com>

backend/langgraph.json

@@ -1,5 +1,6 @@
 {
   "$schema": "https://langgra.ph/schema.json",
+  "python_version": "3.12",
   "dependencies": [
     "."
   ],