chore(mana-llm): thread GOOGLE_API_KEY + default model into local compose

Matches the macmini compose — Google Gemini was already wired in the
provider adapter (commit 2 of the function-calling migration) but the
local dev stack's compose never passed the env through, so the
container booted without the provider and every tool-calling request
fell back to Ollama (unreachable in local dev, LAN-only GPU box).

With this in place the local mana-llm healthcheck reports both
`google` and `openrouter` as healthy and the webapp planner hits
Gemini Flash for real.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

services/mana-llm/docker-compose.yml

@@ -16,6 +16,8 @@ services:
       - OLLAMA_TIMEOUT=120
       - REDIS_URL=redis://redis:6379
       # Add API keys via .env file
+      - GOOGLE_API_KEY=${GOOGLE_API_KEY:-}
+      - GOOGLE_DEFAULT_MODEL=${GOOGLE_DEFAULT_MODEL:-gemini-2.5-flash}
       - OPENROUTER_API_KEY=${OPENROUTER_API_KEY:-}
       - GROQ_API_KEY=${GROQ_API_KEY:-}
       - TOGETHER_API_KEY=${TOGETHER_API_KEY:-}