[bojemoi] mcp: move PG_PASSWORD and FARADAY_PASSWORD to Docker secrets

Commit 922a790

Description

Replace plaintext passwords in environment variables with Docker secrets mcp_pg_password and mcp_faraday_password. Code reads /run/secrets/ first, falls back to env var for local dev compatibility.

Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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