Description

Docker Compose environment variables for LLM and embedder configuration (LLM_PROVIDER, OLLAMA_BASE_URL, etc.) were silently ignored. The get_default_memory_config() function had extensive env var
detection for vector stores (10+ providers) but hardcoded the LLM and embedder to OpenAI with no env var override path. This meant users could not switch to Ollama or other providers via .env or
docker-compose.yml — the only way was through the database config API.

This PR adds env var detection for LLM and embedder providers following the exact same pattern already used for vector stores, and consolidates Docker URL fixing to cover both env-var and DB
config paths.

Supported env vars:

• LLM_PROVIDER, LLM_MODEL, LLM_API_KEY, LLM_BASE_URL, OLLAMA_BASE_URL
• EMBEDDER_PROVIDER, EMBEDDER_MODEL, EMBEDDER_API_KEY, EMBEDDER_BASE_URL

Config precedence: env vars set defaults → DB config overrides → Docker URL fixing → env:VAR resolution

Fixes #4194

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

Maintainer Checklist

• closes Docker Compose env vars (LLM_PROVIDER, OLLAMA_BASE_URL, etc.) are ignored #4194